What do you plan to do with the car? If its going to be a street car, then your best bet would be to replace the rusted parts with replacement "factory style" parts. If its going to be a race car then the options are wide open, from "factory style" replacement parts like above to full roll cage/chassis with your "hulled out" body attached to it, or many levels in between. If your wanting a race car type suspension, no one makes them "off the shelf", they are custom builds.