"marred" metal is usually never good. It's a sign that something has gone wrong (foreign matter or lack of lubrication). It may be fine for a little while but will probably need replacing along with the mating shift collar. It's your choice. Put it together and gamble and hope nothing happens, or do it now and not worry about that problem.... I know I never win at gambling (I reason I won't go to Vegas), so I would replace it, but others have better luck than I do, so go with what makes you comfortable. You will probably pay $50 -$100 for the matching clutch ring and shift fork, so that may factor into your decision.