I used a Centerforce dual friction clutch on my build. Centerforce claims these are good for 600ft lbs at the crank. It was quite the PITA to get proper disengagement from though.
I used a WC T5 out of an 89 camaro with the stock bellhousing. The slave cylinder has 1 inch bore so I used a 1 inch bore master. A 1 1/8 master may have worked better though with the Centerforce DF clutch. Wilwood makes a nice compact sized master.
We also had to lengthen the master cylinder rod to the clutch pedal and lengthen the slave cylinder rod.
