Is it possible? Yes. Is it worth the effort? Not to me. That takes a lot of effort and expense.
yes you can, with modifications
You could get a 305 V8, 350 V8 and V6 ;; your mom needs chapstick
if it is the same size. 3.1 for 3.1 or 2.2 for 2.2 go ahed and do it. you may need to switch intake or exhaust manifolds so all the wires and such line up.
Yes.
Yep! All it takes is $$$$.