the ford racing clutch is junk, I would recommend a spec stage 1 or entry level clutch from centerforce or mcleod. I have had a spec stage 2 and beat the hell out of it, it never gave an inch. but it had alot of clutch chatter, as does my current stage 2. yes the flywheels were resurfaced.
149k mile, 98 GT headswapped, 295 rwhp. 12.9@107
Daily: 04 crown vic sport . . .15.71@89