A friend of mine has a 1983 GMC 3500 4x4 crew cab dually with a 6'' lift and a GM 350ci motor in it. Problem is he needs to sell it BAD. . I told him the only way it would sell is if it had a diesel Preferably a Cummins. What all would be involved in this project just to bolt it in and sell it?How much for a used 12 valve engine? It has a Turbo 400 Auto Trans in it, will that have to be dumped?Bellhousing? Wiring harness? OR . . he said he could take it to Cummins to install it. What should the asking price of this truck be? after the install. . it's in fair shape paint is decent and nothing else mechanically wrong. 
