Yoda,
I just read an interesting article in Car & Parts about timing an engine where the timing marks are missing or distorted. Use a vacuum gauge connected to a vacuum source (like the PCV). Warm the engine to running temp. Adjust the distributer to reach the highest vacuum. If you advance too far, the vacuum will drop off. Tighten the distributer nut and take it for a drive. If you get a knock, retard the spark a little. Hope this helps...
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