Those bearings are probably OK. Rod and main bearings are made with a very thin top layer of pure tin (less than .0005") to assist in quick "wear-in" to microscopic irregularities in a crankshaft surface. I'd suggest soaking a piece of 4-0 steel wool in clean oil, and give the pitted area a gentle rubdown, followed by a thorough cleaning with solvent. That's how us gunsmiths deal with flash rust on blued firearms, without doing any further damage to the bluing.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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