All stock rear mount locations, non tubbed, 904, 4.56's IIRC. A good working chassis that takes work to get sorted out. People can make tuning suggestions, like Calvert. Unfortunately, it's a bit different for every car and cal tracs likely don't want the same set up that SS springs do.
What rear suspension is on almost every good running competitive stock eliminator A body... not SS springs!
I'll stop now as not be arrogant according to another member that can't get them to work either. :)