Have an A thats been sitting for years and is stuck. Pulled the cover off crankcase and oh my its rusty in there! The crank and rods have thick scaly like rust on them, but it comes right off when you scrape it with your finger. Below it is black iron like you would like to see. Question is, what would work best to clean all of that out? Can i fill the case full with something and let it soak for awhile, and then drain it out when i drop the oil pump? The block is cracked so i plan on pulling that out after i get it cleaned up inside. I am looking at getting this one running before its all said and done.