If local parts stores are a no go then your best option is the junk yards in your area. Good luck.
Just curious, what kinda parts ya lookin for?
Oh what a drag man...I had a 1977 F100 with a 351M in it when i was younger...couldn't hold that SOB on the road no matter what you did to the front end!!! Was my grandpa's truck and he sold it to me when i was 16! Hope you can find what your looking for....sure regret getting rid of that truck...
Saw a commercial for rockauto.com last night. Have you tried that?