STORING A FRESH BLOCK

Hose it down with Fluid Film and bag it up.
I would like to add, Keep it out of the elements. Any kind of dry air works best. Not a back yard shed. A AC or dehumidifier in a garage or room works best. Should not have a condensation issue if you have dry air. I also agree with others, rebuild it now so you don't have to freshen it up later. At least the Short Block with oil pan on.