Blockquote "The things Saryn has lied about.
- F-4EJ kai (Especially ser no. 07-8431) being used as a test platform for the GPS guided bombs,
- F-4EJ Kai 431 and F-4EJ 301 having a navigation computer
- F-4EJ Kai (Especially ser no. 07-8431) having carried AAM-4’s despite not showing any actual proof.
- ASM-2 being capable of tracking ground targets
- F-15DJ having a ECM equipment
- F-15J(M) variant having a IRST sensor tested
- UH-1B with Type-64 MAT missiles being tested
- T-2 being compatible with ASM-1’s
- T-2 having a ground radar function
- T-2 having GCS-1
- the F-104J with AIM-9L’s
- Type-74 and Type-10 having ERA bricks allocated for them.
- Type-10 optional composite armour upgrade
- Type-90 getting the Type-10 rounds:"
- F-4EJ kai 07-8431 being used as a test platform for the GPS guided bombs
As far I know is that the F-4EJ serial no. 17-8301 (let’s refer it as EJ 301), and F-4EJ kai serial no. 07-8431 (lets refer that plane as EJ kai 431), are the only aircraft at the time with GPS datalink antennas equipped.
(See image below F-4EJ 301 and F-4EJ Kai 431 from ADTW squadron).

It is true that I don’t have clear proof of them actually carrying JDAMS except the few times they were showed during exhibition, where a F-4EJ and also a EJ Kai were equipped with JDAM bombs on the weapon rack.
Only things I had going for is that the F-4EJ 301 (and possibly the EJ Kai 431 too due to it also being overhauled with a navigation computer in the WSO position,) was used as a aerial launch platform for the TACOM UAV drones. I also know that JASDF procured 27 JDAM kits for testing, although it has not be mentioned which aircraft it was being used on. Yes it could have been used by the F-2, and it’s probably the case.
As previously described, TRDI started the
TACOM program based on the requirement by
JASDF in 1995. In the contract of the program,
FHI designed the system and built six UAVs,
GCS, GSE and the F-4EJ conversion kits. They
also conducted wind tunnel tests, Radar Cross
Section (RCS) tests, structural tests, hardwarein-the-loop simulations, and integrated
functional tests using the real UAV and GCS.
Mitsubishi Heavy Industries was the other
contractor to design and build the F-4EJ
conversion kits to carry and command the UAV
for the program.
Following the contract, the TACOM was
delivered to TRDI and evaluated in the
engineering ground and flight tests between
1997 and 2001 conducted by TRDI with a
support by JASDF. The ground test included
mechanical and electrical checks, ground
vibration test and recovery test. In the flight test
program, the F-4EJ compatibilities and captive
flight tests (CFT) were performed as well as the
evaluation of the four key technologies. The
first fully autonomous UAV flight took place on
May 7, 1999. The system has finally
accumulated 22 F-4EJ flights including 5
independent UAV flights.
The TACOM evaluation program was
completed in 2001 with satisfactory results.
Based on this experience, JDA has just started
the follow-on UAV program in 2004.


It should be noted as well that Japan did purchase 27 JDAM kits all the way back in 2005, however, it is not specified if a aircraft was ever equipped with such systems for tests or use.


JDAM bombs fitted on the external racks to the F-4EJ/EJ Kai phantom
(also those varaints of the EJ and EJ Kai do have navigation computers.)
F-4EJ 301 WSO seat
WSO seat of F-4EJ Kai 431

as for comparison standard EJ Kai WSO seat
- “F-4EJ Kai (Especially ser no. 07-8431) having carried AAM-4’s despite not showing any actual proof.”
Afaik I only have these images from books that mentioned the AAM-4 missiles being tested on F-4EJ kai 431

Then there was this image attached it on a magazine also. but it could also just be a F-4EJ kai with a mistaken AIM-7F/M in low vis paint.
*ASM-2 being capable of tracking ground targets
Standard ASM-2? no it probably couldnt due to it being a IR imaging based,
ASM-2(b) in theory could since it uses a thermal imaging seeker

(Courtesy of the forum post about the ASM-2B Type 93 Air-to-Ship Guided Munitions (ASM-2B) - Suggestions / Aircraft - War Thunder — official forum )
- F-15DJ having a ECM equipment
Here are F-15DJ with a ECM pod attached to the central fuselage hardpoint
Then there is a Interdiction Escort planned for the DJ that’s being worked on.
-
UH-1B with Type-64 MAT missiles being tested
I only have this from Aviation Information, March 1967 issue
(“JGSDF began researching equipment for armed helicopters as well as enhancing the air mobility system by helicopter. Although this research started in 1959, it is now possible to put a .30-caliber machine gun on the H-13 helicopter, and it will be possible to put an anti-tank missile ATM-1 on it. As for the H-13, research is planned to be carried out with a policy to install 2.75-inch rocket’s this year, we are also planning to continue to put these on the HU-1 (UH-1) medium-sized helicopter as well. Since armed helicopters can take off and land from anywhere, they can act with ground troops at any time and support them closely and promptly with various equipment according to the purpose. Even in the bad weather, in which fixed wing aircraft can not fly or attack, the helicopter can attack and fly swiftly even in places such as valleys. In addition, it has characteristics such as hovering or the ability to make various attacks using three-dimensional mobility, and in operation it is used as aerial cavalry, in addition to reconnaissance, alert and battle, medical evac, and close air support with rockets or missiles as the weapons of choice, it is said that it is possible to do effective joint operation with a high speed ground unit. In response to these demands, countries such as France, West Germany, the Soviet Union, and the United States have also started experimenting in helicopter weaponry and tactics. In particular, the United States is not only merely arming their helicopters, but also experimenting with fast and heavily armed helicopters. The JGSDF also wants a high-speed heavily armed helicopter in support of ground troops as a future direction, research is proceeding as a problem after the 4th defense plan.”)

-
T-2 being compatible with ASM-1’s
Reason why I think it could use them is because it has the switch in the cockpit and in the external pylons to be fitted with them. Although it has to be noted that according to the flight manuals it could not use them.
Cockpit of the Mitsubishi T-2
Pylon of the Mitsubishi T-2 Blue impuse
Manual of the T-2

Manual of the F-1

here have a FS-T2 with ASM-2’s

In summation, yes I could be wrong about that.
-
T-2 having a ground radar function
As far I know, I have never mentioned about it before since I wasn´t really sure myself if it had that feature or not, It could be that it has Surface scanning radar where it can could lock on to surface targets. But as far I know off, I have not mentioned it yet to my knowledge. if so then my apologies.
-
T-2 having GCS-1
There is a picture of a T-2 with GCS-1 bombs, although how it´s supposed to use it I am not sure of it.
this T-2 might have been modified with a ballistics computer to operate it if it was used in testing but I don’t know much about it and am still doing research about it.

-
the F-104J with AIM-9L’s
Here is a instance of a F-104J carrying AIM-9L

Also I would like to upload more and show my side of the images in question regarding your points.
But as of now am nowhere close to my home to do so.
About the Type-10 all I know is from the documents that it was assigned to them but I have no idea what they look like nor what their performances are.
I am aware that I can get things wrong and I got wronged often in the past, and still get somethings wrong to this day. I take note in those things and learn from it.