Need options on custom building 4 link for narrowed rear.

[Strykerta]

Well its finally time to get my build going on my 63 stepper. Its gonna be a street driven truck with quiet a few horses. I have a 9 inch rear im going to narrow once i figure out the suspension. My rims are 15x14s and i have been searching for anyone who has done similar with no luck. The suspension will be inside the frame rails due to the rims being almost to the rails. Im not concerned about drop. It will be coilover. Triangulated or parallel? Any advice would be great.