I was accepted at 6'3", as said above: it's buttock to knee length that's most important. Otherwaise you end up being knee-capped if you eject!
I think that as long as you are OK for the training types then your height would not stop you from being recruited - It might restrict your choice of aircraft types out of training though.
Of course, if you are a 7' gorilla then you won't fit in anything!!