Start from the ground up.
Take it all down. Remove the flywheel, have it surfaced. replace the shaft bushing in the middle. If it is a bearing replace with bushing.
Next buy a 180 lb 8 spring HD clutch plate, and roller release bearing with grease fitting. (dont forget to grease it 2x a year)
Check to make sure the release bearing was not install backwards and the petal return spring move the petal freely when no hooked to the clutch fork.
Also check to see is the pivot rod between the petal assy and the release bearing fork isnt adjusted all the way out. If the wrong plate or bearing was installed, a way to compansate would be to crank it out, restructing the fork travel.
Also anyways post engine size, 3 or 4 speed and floor or 3 on the tree linkage