Let me modify my previous suggestions for suspension rules so that (as I understand it, at least) all of the cars now running will conform:
Fiberglass flexure is the only allowed springing means, other than the tires themselves. No metallic or elastomeric springs allowed.
Spring damping must be via friction dampers only. Viscous dampers and elastomeric dampers are not allowed. Friction dampers must be run dry, with no liquid lubrication. (This eliminates the expense and maintenance of shocks.)
The engine must maintain a fixed relationship to the rear wheels whenever the car is in motion. (This permits T-plate cars, or cars with other floating rear pods, as long as the engine and transmission is part of the pod.)
These rules also allow someone to convert a suspension car to compete in the pan class.