So far I've replaced the springs and shocks. What will be replaced are the rear lower control arms, rear upper control arms, front control arm bushings, balljoints, tie rod ends. The tie rod ends will be a bump steer kit. This is something that Saleen didn't offer in their catalog but it is something that really changes the handling characteristics enough to warrant putting them on the car.
The whole suspension needs to be overhauled. Just something to consider if you are buying a Fox Mustang with the youngest of these cars being 20 years old.