I broke down and got a self-powered 6v timing light. A little spendy but it's far more convenient.
https://www.amazon.com/Proform-67414-Powered-Timing-Light/dp/B000A8FGPG I could be wrong, but with the oil pump in the wrong position, the engine fired up but ran very rough and nothing could make it run smooth. But a faint memory.
Just because you said you removed it, there's the possibility it went back incorrectly, and it's kind of a subtle thing, that tiny mark. I would just keep that thought on the back burner, and if you can't get it running as it should, I'd pull it and check it.
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