Body Swap?

[macrod]

I purchased a 78 2wd and a 85 4wd K5 blazers for five hundred each. Both are in good condition the 2wd is a four speed with no air or power windows, the 85 has everything, PW, PL, P tail gate, air etc. I was woundering how hard would it be to either:
1, move everything from the 85 to the 78 this would include doors, tail gate, air condition system and front clip.

OR

2, swap bodies. is this vary diffulcult, how much do you think it will cost if I unbutton everything.

I would like to keep the truck reg as a 78 and also keep the 4sp.

Also if anyone is looking for parts I have a feeling I will have a lot of extras when Iam done.