Fellow datsun lovers,

I have a 72 datsun 1200 with a a12 engine. Im just about ready to fit a supercharger off a toyota 1g-gze engine, to my a12 engine. Got everything figured out but valve springs. Im using the standard cam, but this supercharger will be running around the 8psi mark, so heavy duty valve springs will be needed. The car is used for motorsport purposes only. Any suggestions on what brand and type of valve springs to buy would be greatly appreciated.