Glad to see you discovered the root cause, it always worries me more when something goes wrong and you can't find a reason.
You're right, it doesn't get said enough that when you start using aftermarket parts that you have to check everything, 50% of it needs rework right out of the box. You were likely fine before the distributor was reshimmed when it was recurved, but it isn't really the fault of the guy who recurved it, he did everything right in making the distributor blueprinted and the way it should be, you just happened to get bit by tolerance stack-up all going the wrong direction in your combination of parts. Chalk it up to "live and learn". Now you know why engine builders charge what they do.
No need to reprime the oil system, it is basically full now and the pump will refill in the first couple seconds as soon as the engine is cranked on the starter.