Ask Bill Vose about having the beams bent if you really want to get it to where bushings can help.
That is going to take an OLD school alignment shop.
Find the oldest crankiest sob you can and pay him well for making it right.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.