OK, here go's. I picked up a 74

4x4 Short bed for my son and I to build for his first truck. He doesn't even start driving for a year, but I need to get started now. My questions are:
-Rear end is junk, will one from a 72 blazer fit, ie: perches, width and all that good stuff?
-Doors are junk also, A buddy gave me a great set of doors from an 85. Will they fit on the 74? If they do, will a weatherstrip set for a 74 work, or will I have to get a seperate set for the doors?
Thanks!
Mike