1939 WC advice needed

I pulled the engine on my WC this past weekend. When I dropped the pan I noticed some rust on the crankshaft and rods. My plan is to rebuild the engine, which has not run in 30+ years. Should I attempt to remove the rust or do machine shops normally do this when grinding/checking the crank?

Also, I noticed a crack in the clutch housing. It is not all the way open, but looks like a hairline type crack that runs from the top down a ways. Is this a serious problem? Thanks for any advice!
 
Cracks in the flywheel are common- just from repeated expansion and contraction because of heat generated. Rust on the crank is easily removed with fine emory cloth. Shop grinding of the crank would remove it as well.
 
If the rust is not on the bearing journals no problem. Just go ahead and clean it. The journals should of had oil on them so they should be good and clean even after sitting for years.

The crack in the housing should not be a big problem. An old fix is to drill a tiny hole at each end of the crack to try to stop it from getting bigger.
 

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