I'm running a centerforce dual friction in my 77 pickup. I modified the pivot point so the pedal travels further and have had no problems with going overcenter. I think I got lucky though as I never knew it was an issue.
I had a hays bb clutch that broke two of the three pivot arms and I had to start it in gear and shift without the clutch to get it home. Not a big deal out in the country, but I was in the big city when it happened I've concluded it was a cheap clutch, but the even cheaper Ram clutches I had used up to that point lasted better. Now my centerforce has been on four engines and is still going strong. (disclaimer: only one of the engines failed, I get bored easily)