What did you do for motor mounts? Did you make your own or did you find a kit?

 

Contact Offroad Design and talk to Steven, is the king of swapping anything into a 73-87 k-series Chevy pickup.

My opinion, find an NP205 unit, order a 32-spline input shaft from ^ and call it a day. I did this with mine when i mated a Th400 to my NP205 and it was right as rain.