I would buy a TDC locator/stop once you have one it's easy to see if the balancer has slipped or the marks are in the wrong place. If your balancer is off then everything that builds on that will be also. With a fresh rebuild that's one of the first things I do, even before the heads go on, as they have been known to get mismatched. Now that its complete its still not hard to double check. You can check your advance latency through the rpm range incase a module is messing up. Just set the whole table to the same fixed number and get a good light. Plug in the timing connector, warm the engine up and have a buddy rev the engine very slowly. If you see changes that's a clue as it should be fixed at all points.
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