Super Stock Spring Reconditioning
Sagging is the biggest issue with most springs and especially with SS springs. There is the process of re-arcing the springs if you can find someone who knows how to do it. (Re-arcing all of them instead of just one or just adding one.) As for front bushings, if aluminum is too harsh, poly is a good option. New springs would be nice but the longevity may not be there and "Launcher" springs by Tri-City Competition are no longer made. They seem to last forever (I have an old, very well used F-body set on an Aspen wagon showing no signs of sag. But Cal-Tracs probably helped with their discontinuation.