Oil leak behind the cam

Success! Got oil flowing through all rockers on both heads.
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I was turning the shaft with the drill at full speed, “next thing you know old Jed’s a millionaire!!! Oil that is, black gold...Texas tea...” I had an oil fountain squirting a foot into the air! Funny thing though, I noted the balancer position when it happened, and it was right at 0 on the timing cover. Next time around it was maybe 10* before the 90 mark I had made. Is this a problem?
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Also a question about the priming process. Once I get oil flowing to the heads, am I done? How long should I let the oil flow?