Many,many , many SS Mopar racers used them for years and years.
I'm sure there a decent piece to start with for the W2 so I wouldn't hesitate at all on using them up
John Dieanna used them on his old M.P and later Comp Eliminator W2 motors, he let the clutch out at 8200 and shifted it around 8800 RPM work As far as I know he never broke one either up

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)