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SooCutlass thanks for your reply. There were 2 versions of the 330. A low compression and a high compression. Mine is a 1967 9.0:1 that might be slightly less because it's bored .30 over and it's using a modern/thicker head gasket.
So what you are saying about the timing is that I should forget about looking at the timing tab with a timing light and hook my vacuum guage up and advance the timing for the highest vacuum reading without any pinginig? I have heard of using a vacuum guage to set the lean/rich mix, but not timing. At this point if it keeps me from ripping into the motor I will try it.
As far as the vacuum advance...I have used a manifold vacuum source and all of the carb vacuum ports with no difference. Also, I don't have power brakes.
Any other way to check the vacuum advance on the distributor?
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