Let's say you buy a basic '75 Duster /6 that is pretty well used up. When you pull the suspension apart to rebuild it, you find a LCA pin has broken loose. So you pull the k-frame to get that welded up. Might as well fully weld and gusset it while it is out. Or even better, find a V8 k-frame and get it gusseted and welded before swapping it. And if you are going to rebuild the LCA, why not put poly or better bushings in. And stiffening plates are an easy upgrade at the same time. Bolting the LCA back in, why not use adjustable struts since the poly bushings cause problems and you have to buy parts either way. Shocks are absolutely junk, so why not upgrade? UCA bushings and ball joints worn out? Buy some new ones. Torsion bars all sagged out? Why not put some bigger ones in? Car didn't come with a sway bar, so buy an aftermarket one. Steering box slow and/or worn out, why not a Borgenson box? Other than brakes, wheels and tires, you are done. I don't see that as a long way from stock