After some searches I find there are more than a couple of pitfalls in trying to upgrade a 1972 904 to five clutches, in order to handle the 408 I built. With 520 torque, I want to be sure The 904 will live a long life. I plan on using a full manual VB, and will take it to the track with slicks a few times. Who can steer me right and sell me all the right parts?