The two classes I'll try and compete locally in are drag radial and ez street. These require factory style rear suspensions. If your car was originally a leaf spring car, it must have leaf springs, or cars that have factory triangulated 4 links, like fox bodies are legal as well. As long as you haven't changed what came on the car from factory.
As far as the rear end you can run anything you want from a 10 bolt to a fabricated sheetmetal 9".
Brett
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