Hi Guys, as I see it, the rules are really straight forward to set up. It should be devided into two classes, normally aspirated & forced induction,....... period. ALL of the cars run bigger tyres, All of the cars run bigger brakes, All of the cars are set up to run better than stock, sooooo, the fact that one car runs tubular front suspension against a stocker isn't really a consideration, as the stock suspension arm car might have a bigger hp motor anyway, levelling the playing field. You really can get lost in trying to make rules to accomodate everything. Keep it simple, NA against forced !! If needs be then add oner more class for tube framed cars/SN65 style cars.This after all is supposed to be an enjoyable day out after all. hth