[Mark42]

There is a marine product called "Fogging Oil" that is a very sticky oil used to coat the inside of two cycle motors for long term storage. It will work great on a bare block. Call your local marina or do a search online and find it in a spray can. Spray all bearing/machined surfaces and the stuff will turn sticky and it doesn't run off. Then wrap in plastic and you won't have to worry about rust on important surfaces. Will work much better than wd40, motor oil or even gear lube.