Looking at improved production (ipr) class for hillclombs and track days to start with, then possibly super sedans if I decided to modify the suspension type.

Main restrictions for ipr are no mods to suspension pick-up points or changing of suspension type, plus engine has to be from the same company (Nissan/datsun) with the same number of cylinders in the same configuration. Also wheel flares cannot make the car more then 100mm wider then standard and pretty much no aero.
Super sedans are pretty much anything goes but the floor and firewall must remain 'standard', but anything short of a tube chassis doesn't seem to be an issue. But the car has to have the same/similar shape, so no crazy aero.

Basic plans for ipr are Nissan cr12de bored out to 1.3 with a Toyota 5 speed, then super sedans will change gearbox to a transaxle gearbox (in the hopes of better weight distribution and less overall weight) running double a arm (double wishbone) suspension front and rear.

Located in Adelaide, south australia.