I may be mistaken (have been once or twice before, or so I was told) but I doubt a scuffed face on the clutch will cause much problem. It should be easy to eliminate by buffing it out -- OR -- you can just run a used belt on the clutch for the first ride if you're concerned about belt wear. I seriously doubt you will find that a scuff mark impairs performance. You'll probably also find that after a few miles, due to the polishing action of the belt on the clutch face, the scuff is gone.