my 77 someone before me has put in a 460 . so are the frames any different or can i swap bodies? i guess another option is to take out everything from the motor back for 4x4 reasons being the other pick up will have a married set up and my 77 missing parts . If i go with this choice things should all bolt up shouldn't except the transfer case cross member? should the 4x4 lever fit through the existing hole ?