I am having trouble with a SBC V-8 and a 5 speed Getrag. The throw on the throwout bearing is just over a 1/2" more than what a stock throw is using a V-8 Archie and a Centerforce Clutch. I called V-8 Archie today and he thinks its due to me using an aftermarket throwout bearing, to replace it with a GM Delco bearing?