If you live in a humid place like me in Atlanta, unless the parts are soaking in oil or coated with grease they will rust. Humidity causes condensation inside the bag. I use STP on cylinder bores if I know it will be a bit before the engine will be running.
@Plumcrazee70, since you got the raw end of the deal with this motor and if you are on a tight budget because of that, I have a brand new 214 224 @ .050 .444 intake .466 exh lift hydraulic flat tappet elgin cam on the shelf I will give it to you if you need it to get back up and running. It is an old school cam that was very popular back in the day for a street engine 340/360.