Tinker - You may be in luck for a donor truck. Here's a FB ad for a
1951 Chevy 3100 5-window in Blunt, SD. Thats about an 8 hour drive one way from what I can tell. Pictures look like the frame is pretty straight and still intact and the cab looks miles ahead of yours in condition!

The original ad price of $3k has been reduced to just $1,500. I think it would be a good opportunity for your truck resurrection if you can handle the road trip.
