Hi Kenny,
Cool, I'm not the only one in the IL Chapter that likes classic Ford trucks!! I have a '73 F100 longbed that spent most of its' life in the Arizona desert, so it never had rust problems. I had it repainted in '04 and I only drive it on sunny summer days. It's a 390 V8.
Good luck on the restoration of your '75! I've restored 3 of these trucks--they're alot of fun. If you don't have alot of rust issues to deal with, that's a real plus! Actually, the owner of the shop that did the paint work on my trucks brings back rust-free parts from out west, so he may have some of the parts that you're looking for. Let me know if you're interested and I can get you the phone number. Also, there's a salvage yard in Kankakee called Acme auto parts that has like ten of these trucks in the yard. Not much is left as far as body parts, but you may be able to find some decent interior stuff, trim, etc.
-John