Salvagable Block?

OK, lets say I take it to the machine shop, have it checked out and its a usable core. What would be the best way to store it once its cleaned?

Right now with all my parts I clean them down, spray them with marvel mystery oil, wrap them in Saran Wrap and put them up. The parts are going into a non climate controlled shed. Basically out of the rain.

Am I doing ok, or is there a better way?