I saw some old trucks and stuff outside of Dallas on I-30, and I think an old 60 panel, but don't have a contact for the guy. You could also try Midway Auto parts outside of waxahachie as that's where I got a door for my 59. However, all that stuffs up here in north texas. Would think you might find stuff closer to home. There is also an older car parts boneyard in Denton just north of dallas, but I hear they're pricey too.

\'59 Chevy 1-ton
'72 c-10 (in progress)
The Great Rust(less) Mountain
\'47 Jeep cj2a