Are you sure it's not just crusty carbon buil-up from infrequent oil changes? I haven't seen that before but I sure wish you could post a pic. If it is pitted you should have a machinist magna-flux it and inspect/rebalance it. Since the bearings looked great you should only need to polish the cranks bearing surfaces so long as it passes the other inspection.
You'll need to have a machinist polish the crank anyway so have him give his opinion at that time.
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Tyson Schmidt
72 911 Cabriolet
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