frame question

[kanuck]

I was out and about today and bumped into a 1978 short step in a towing yard that was going to end up going for scrap. It is sitting on its front dif with no axles and on the drums in the back. Yes it is very rusty and has no engine and tranny, but I can take it away for $100 if I can figure out how to move it.

Question is, since I have a 1980 2wd with a frame that needs a little work, can the 4wd frame be used to make a 2wd and how much trouble is it. I have read question about converting the other way which I know means adding the leafs. This way I would need to bolt in the front cross member.
What problems would I bump into???

Thanks for any info