Magnum block into Duster

I have a 72 duster with a worn out 318 in it and I also have an 01 ram 1500 with a 5.9 magnum small block. The rear end on my 1500 recently gave out and instead of replacing it, I just got a new truck. I'm wondering if I could put my 5.9 magnum block into my duster and how much fab/work it would require. Also wondering what I would have to do with the rest of the power train too. Any help?