That's a lot of money but I sold a nice 68 dart 6 cyl car to a friend. He installed 318, new interior, paint, etc. Does all the paint and body along with his Dad. Told me that he ended up well over 30k. I just don't know if one could do a quality job on a bona fide swinger 340 for 40k.
True. These days it would be hard to buy a car and restore it nicely for $40k even doing most of the work yourself. However, that is not how cars are valued in the market place.