you'll probably do fine. just finished up flying the F-14 a few months ago. i'm 6-4, 175, also a runner-type. i've seen fireplug guys gray out, lanky guys too, everybody has good and bad days. eat right, sleep right, do your 'hook' right and you'll be ahead of the game.
as far as size goes, the tomcat had plenty of room. of course that doesn't matter to anyone except the iranians now. i've seen some pretty big guys in just about everything out there though..
good luck