I'm in phoenix on vacation now. Friday I went to check out Dart Bodies inc. First class staff and work. Anybody looking for a 70 dart? Anything to do with old cars is fun.
In Texas I think the car could bring $7,500. Maybe more if you posted some pictures. If the car is in Alaska i'm sure it would be worth more. If you are looking to buy it why not post the asking price?
You will need a different drive shaft and the slant 6 t- bars will work but might be better to swap in some bigger bars now if you want to do it right the first time.