Going to try and get as much of any type liquid that is in there (water/oil) OUT... my brother mentioned getting some WD-40 into the plug holes (rotate the motor so the pistons are near vertical) to make sure things move freely after sitting. Leave it a couple of days on each side.
ATF works well too. Just a few squirts in each cylinder and spin the engine over. It's tough to know how far to go. Mine started leaking out the frost plugs and they are a turd to replace in the car so I pulled it and went through it.