The good thing is, that stuff is pretty cheap. On
Mustangs Unlimited - The Premier Source for Mustang, Shelby and Cougar Parts and Accessories you can get whole upper and lower control arms, or you can just get the ball joints to bolt on. By the time you factor in your time, it may be cheaper to just buy the whole thing. The stock ones can handle the power you are putting to it. I like the 1" drop springs. They cost the same as stock springs. Under 100 bucks. You also want roller spring perches. KYB shocks are more stiff, and Edelbrock shocks are a little less stiff. Just depends on what ride you want. It would be well worth it to do it now while you already have the stuff apart.