51 GMC 1-ton with 302 straight 6.

I get a fairly loud scrapping noise just as the pressure plate is actually clamping the clutch plate to the flywheel, but not when the clutch is out or when fully depressed.

The 302 came with an oddball recessed flywheel which I replaced with a resurface 248 flywheel, and a new 248 pressure plate, release bearing and pilot bearing. I used the stock bell housing and SM420 tranny that had been mated to the stock 228.

The clutch seems to operate perfectly,no chatter or other problems, although seems to engage pretty high for a new clutch.

It almost sounds/feels like the clutch plate might be warped, thus does not engage smoothly, although when fully engaged there is no noise. The scrapping sometimes sounds metal to metal, not just clutch lining to metal.

Any ideas?