Finally got the 428 in and checked the clutch geometry with the centerforce dual friction. I used an adjustable pivot stud out 3/16 from the stock length and a n1488 release bearing. The clutch release fork is about 10 deg angled to the flywheel when it's engaged and about 10 back when it's released. [The part inside the bell-housing] The clutch has an air gap of .066" when released, they call for .030" to .085". And have the required free play at the top of the pedal travel. The longer release bearing worked with the stock clutch but this is how I had to go with the D/F clutch. I hope it works as well when it's running. And I also hope the info is useful for anyone else going with a centerforce clutch