On my '70 Satellite "Road Runner" wagon, just doing all the bushings, good shocks, up-sizing the front bar & adding a rear bar made a huge difference, even with 14x7 wheels & 225/70 tires; it wasn't a threat to a well-driven proper sports car, but plenty of fun and a surprise to most people. The car had 11" drums and the HD suspension: not cutting-edge by any means, but in proper condition pretty effective for a street car.