On an engine sitting for any time I would have done an
oil change immediatly. Sounds like you revved it pretty good...did you wait for temp to get up. Hard to not jump all over that power when you first start it up...I never go over 1500rpm till thermostat opens, even then dont get all over it for a couple of miles to make sure
oil is up to temp also..can you tell if the rocker was oiling?