Having tried this in the past.... The body points do not line up all that well and it takes a lot of fabrication work to put that older body on that newer chassis. You have to switch out body mounts for the cab, the core support will need modification to fit right, and more.... It is far easier to swap the front cross member and rear end than to do the body swap. It's not quite a straight bolt-in, but it is close. You tend to need to drill a couple holes in the frame and auger one a bit to bolt in the cross member but that's typically it. A fraction of the work of trying to swap a body.
So if one finds a donor truck, this is a fairly easy swap? I would love to do this to my '61 and ditch the torsion bars. Plus I would get disc brakes. That sounds like a fun swap.
Kyle
