My last clutch when I was racing the car was an old Hays MK12 adjustable and they weren't very easy on the drive train. I had it set at 1200 for the track and 2000 for street driving. I used a RAM bronze disc and that probably saved the transmission because once it glazed over they slipped pretty good. I never ran bigger than a 9" tire with 833's or a Richmond 5-speed with face-plate gears.
Now I don't race it much anymore so I am running a CF2 with a Mcleod 500 series dual friction clutch disc.
If I race it again I probably will only use DOT street slicks so it doesn't hook so hard twocents

Gus beer

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60