I am building a '69 El camino with a big block 396 that is going to have about 500HP and 500lbs. of torque. I am either going with a richmond super T-10 4 speed or a richmond 5 speed. I may be shooting a 100 shot of NOS on the combo as well. Does anybody have a recommendation for a long lasting clutch? Are the richmond transmissions going to hold up to this kind of abuse? Or is there a better manufacterer?