Before we get into how to improve your suspension, we really should start with a safe, reliable suspension.
Are the ball joints and control arm bushings in decent shape and not dead? To test the ball joints and control arm bushings on a typical muscle car front suspension, place a floor jack under the lower control arm and raise the tire until it is about 6 inches off the ground. Now use a 3-foot-or-longer prybar to leverage under the tire. Does anything move? If it does, then either a ball joint or control arm bushing is excessively worn. If anything is worn, replace everything—ball joints and control arm bushings—because all these parts are probably dead. That way you’re starting with a solid, reliable suspension. As a tip, log on to rockauto.com and check out the prices. I’ve found the company has the best deals on good suspension parts like Moog for almost any car. The same inspection goes for the steering components. Is there a dead spot in the straight-ahead position in the steering box? If so, it’s time for a new box. Buy a good performance box before getting into massive changes with the suspension or look into the story I did on swapping steering boxes. Do a search on steering boxes in the tech section of this website. Also consider parts like those heavy-duty die-rod end sleeves from Global West, Hotchkiss, or Detroit Speed. These are not expensive and won’t fold under a high-speed corner.