Oil pump
Also you can make a primer with some 4 inc pvc, a couple feet of transmission hose and some pressure fittings. Hook one into to your air compressor, the other to the oil galley plug and ease the pressure into the pvc up to 30 ish lbs. Might cost $30 bucks total.
Whatever you do, don't crank it dry.
Have some confidence in your own work.
If you built it right, then priming isn't a big deal one way or the other. In other words, if it were me, I would quit worrying about it and fire it.
I've done many oil pumps in my career, and I've never primed one of them. I do make sure they build pressure right off though and make sure that I've doused everything with oil while the motor was apart and/or have assembly lube on things. You're not working with a brand new motor here so there's a lot of things that still have a film of oil on them from the last time it ran.
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