I am getting the parts together to redo my 68 C20. The engine code is a 327, 350 4bl. Can I replace original 4spd with a nv4500 5 speed ? I also would like to replace original transfer case with the one from a 2002 suburban 8.1 4wd I have in storage. I also have 74 C1500 350,auto and transfer case in storage. I really would like to gain the extra gear from the 4500. What think ye?