Anything is possible with $. IMO just buy another truck that's 4wd and swap the body if you've got sentimental attachment to this one.
Please sell that clean 2wd and just buy a 4x4 before chopping that one apart. There is a market for both and there's a lot more mojo in an old school, unmolested truck.
I was pretty much going to say that. If there is sentimental value to it a body swap will be best. Finding a truck that has been rolled over might be the hot line. If you dont have an attachment I would just look for another truck with what you want.