Check out my pressure plate

I gave seen a lot of pressure plates,this isnt the worst i have seen.
Heated so bad there are fractures on the surface,blue like a gun barrel and still worked.

Orbital sander and some 220.
If it cleans up,run it.
If it doesent, run it.
A clutch is a service item, like brakes,run it until it actually is in need of replacement.