Lookin forward to readin up on some of this myself, although i have a 95f150 2wd, is it much dieerent from the 250 4x4 the OP wants to do besides suspension? Would modifications need to be made to the suspension? I was lookin into either a 2nd gen 12v or a CR. sorry for the hijack
Cummins put a lot of 4bts into Grumman P30 Step vans and the like in the 1980's in their repower program for Ford engine packages like the original worn out 300 sixes. As a result you can get Cummins adaptors to Ford small block bell housings and use a small block Ford, eg. 351 clutch package and flywheel. They are out there and work with the 6bt with the straight six engine stands and mounts. 4btswaps.com , has all you want to know about this and more. 4bts and 6bts into a Ford are about the easiest swap.
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