That's weird. Almost EVERY crew I have EVER seen had rust in the roof line somewhere. Most have it about midway back on the cab just about the drip rails, and a lot have it in the front, upper corners above the windshield. The 77 I had was BAAAAAD, but it had those stupid cab marker, trucker type lights that lead to having 5-6 "skylights" in the front of the roof as well as the normal drip rail rust.
Have you flown a ford lately?
1938 Ford Pickup = hot rod
1970 Ford F250 long bed & 1974 Ford F100 Supercab - 2wds
1974 Ford F250 4x4 Crew cab thread in "motor swap" forum
1989 Ford Ranger= Never gonna be done...
1972 Alfa Romeo GTV & 1999 Toyota Tacoma 4wd = DD