I never worry how long an engine sets after assembly. But before I fire an engine for the first time I always use a dummy distributor (remove the gear) to pump oil through the engine. I also bar the engine over 90 deg. at a time to fill all the lifters. I also did this after rebuilding 3406 Cats and 855 Cummins diesels. I would feed 5 gallons of oil through the oil sender port. Never had an issue.
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