I guess this is just a heads up on having a crank polished, I had a stock 350 crank polished to use in a cheap 350 crank looked good we brushed(plastic) out the oil holes to make sure it was clean and put it in the block and was checking clearances and noticed some slight scoring on two of the rod bearings I thought maybe some dirt got in there but we try to make sure everything is clean looking into it further it seams the edge of the oil hole is raised appearently from the polishing you can actually catch your fingernail on it. I had to file the radius of the holes so they didnt stick up... just something else needing to be looked at I guess.......

 

Before the polishing is done, chamfer the oil holes. A small round stone on a die grinder works best if you have it.