2wd/4wd truck body swap

I looking for any information about swapping a 2wd body on to 4wd frame. I have a 1986 2wd truck that the body is in great shape but the engine is in need of repair and a 4wd 1986 that the body is rough
but has a new crate motor that runs great. I am not sure if it would be easier to replace the engine or swap the body. It would be nice to have the 4wd system but I have not did an off frame project before. I am a rookie wrench that can get the job done when needed. My first concern is the cab of the 2wd fitting on the 4wd frame due to the transfer case. They are both the same year...long bed trucks and would make a great truck once joined together as one.
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