Well, I just picked up two 84 1/2ton trucks, one is a long bed, and the other is a shorty step. The shorty has a dead six and a rusty cab, the long bed has a good cab and 350. What I want to do is swap the engines and cabs, but I don't know which VIN I will need to use. Oh, and I almost forgot the best part, they were both FREE!!!!!

Help me please.