I've stored engines for YEARS "in the vehicle" with full air filters, closed throttles, and full exhaust systems. Works OK.
Change oil prior to storage, and run the engine long enough to get the clean, new oil circulated. No need for contaminated oil to corrode the bearings.
Best practice would include oiling/fogging the cylinders, a bigass plastic bag, a couple of desiccant packs, VACUUM THE AIR OUT OF THE BAG and then tie the bag shut "air tight". Assure that there's no critters that can chew a hole in the bag which lets air/humidity inside.
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