Getting crank micro polished may not be a bad idea, just because you can't feel the difference doesn't mean the babbit surface on the bearings won't... WD-40 used with 1000, 1300, followed by 1500 grit sandpaper with and a shoe string wrapped around it and hours of elbow grease will put the new back on it, if you want to go cheap. If it acts like it needs anything coarser than 1,000 grit to bring it back quickly, it may still need the high speed version at the machine shop. I recommend cosmoline spray from Fastenal, although another good product for short term storage of parts is WD-40 chain wax.
