Hey not sure on your rules over there but if you have none then just go berserk like the early 70s when some clever south african peeps built cars that would have destroyed any factory brand racer from any part of the world. Im sure there are plenty of crafty engineers there if you just look a the Ford Perana windsor v8 and Chevrolet Firenza v8. Just recently destroyed Porsche's best in classic tarmac events.