83 3/4 4x4 diesel drivetrain onto a 68 1/2 4x4 frame

[qksilver]

Well, lets just say it's wild hair time. Been feeling pretty good the last couple of days, so it's time to play around again.
Done quite a few frame/body swaps but this one is different. I have a complete running 83 3/4 4x4 diesel burb and a few 67-72 burb bodys and one 68 1/2 4x4 rolling frame. n
I want to swap all the running gear and crossmembers from the 83 onto the 68 frame. I have been told the 6.2 uses the same mounts as a big block. I have also been told that the later model crossmembers with work in the 68 frame.
I know the rear leaf spring perch spacing is different
Any idea's............got the measuring tape out and it looks like things will bolt in except the engine/frame mounts. I ran into this problem on a 2 wheel drive swap the 80 and up frame/engine brackets were to tall.
I was going to try a BB swap into the 68 4x4 but that seemd to easy!!! So I want a diesel with air ,400 trans and 205 transfer case ,full floating rear and Dana 60 front
I posted this also in the burb forum.
But as I think this would be just like a bb swap.
Anybody use later 73-up crossmembers on a 67-72 frame. I am not worried about minor clearance issues concerning the trans hump or heater/ac box but placement of engine/trans/transfer case crossmembers and what to use for engine stands.
Thanks for any advice/pictures etc
Steve