I would not buy that truck with the intention of doing anything else but wheeling it until it breaks. Fords are pigs when it comes to swapping. I believe there is a special hell JUST for Ford engineers. My brother and I finished pulling the 460/C6 trans out of his Lincoln. BIG, HEAVY, long pig components, and it took days just to tear the front end apart to get it out. No way I would try to put a Chevy back in. Dad had an old 81 Ford as well, and has a '78 Detroit Diesel powered ford work truck Broke down and sitting of course). All of them have been an absolute nightmare to work on, whereas tearing down a Chevy takes 1/10th the time and aggravation.