Iran has been doing a good job of keeping (some of) it's western weapon systems in operating condition despite the embargo. Remember, they have the ability to manufacture certain parts by themselves, although for others they'd have to break up other a/c into spare parts.
Iran was going to get 75 F-16A/B's in 1980, but the revolution occured just months before the delivery date, so they went to Israel (who were going to get F-16's anyways, just a few months later) instead. The IAF used the early delivery as much as they could, destroying what was to be the Osirak nuclear plant in Iraq only a year after taking delivery of their first Fighting Falcon.
Iran also operated (still do?) F-4E's, and AH-1's among others.
Pacifism only works if EVERYBODY practices it