LMH Larry if it is a short time, maybe a year, Seafoam it, 2-3 heavy bags, keep off ground on a small 4x4 piece of lumber. Some times you can find the extra large vacuum bags to do this. Get a couple of moisture bags to put inside the 2nd bag. Swap bag ends 180 degrees. Have motor lay on the back end of the block pointing up. Some guys lay them on the
oil pan location. I am not a fan of this.
If you are looking for years, Cosmoline is the only way to go and double bag it. Its a pain to remove but you can take the block to a engine cleaning guy and it will get hot tanked and remove this stuff. It's been used since WW1 and still works well. This is for any thing more than 2 years. Good luck Rick L.