That is a nebulous statement.
do you mean;
When deliveries were first taken?
The Squadron(s) were stood up?
IOC milestones were met?
When thy first went into combat / cruise?
and further what do you mean by it, as in “was it” possible, everything we have points towards the fact that it was, but “did it” happen its not clear.
That is the issue.
If the in game Early was supposed to be in its introductory config (July 1974)if that was to be the case where is the AN/ALR-23 IRSTS that it should have among a number of issues with the 3d model that would make it not a Block 130 aircraft.
Summary
as per the AIM-7F CS & SMC
The dates of note are
IOT & E complete ; September 1974.
This indicates that the design is frozen and that it is ready to be submitted for trials, certification and a decision on production timelines. This additionally does not preclude the existence of preproduction rounds, or their delivery.
Summary
There is likely to be similar questions that may well show up with the F-16A-15ADF and the eventual introduction of AMRAAMs, as they did not receive them in US service(though were wired as such), but the same airframes did later in Italian service. as Block -25 &30/-32 aircraft retain the full compliment of A2G ordnance so present questions as to a good multirole airframe
USS Enterprise sets sail September 1974 with VF-1 & VF-2 aboard, though they have had their F-14A’s since July 1973, and been at full strength since July 1974
Production approval; October 1974
400 units were to be procured for Financial Year '75 and as per Wikipedia
The federal government’s fiscal year is the 12-month period beginning 1 October and ending 30 September the following year. The identification of a fiscal year is the calendar year in which it ends
Which means that up to ~400 units were in existence before the arbitrary April 1975 cutoff for OP Frequent Wind, and of course without absolute granularity of operational deliveries to Enterprise, there is no way to tell exactly if / when they were delivered to the squadrons, other than that they existed and that the F-14’s involved were cleared to use them had they had them in stock.