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This is what I was thinking also. It sounds like you have already checked it, but if not, use use a whistle, or screwdriver, or whatever, down the plug hole to make 100% sure that the marks on the balancer co-incide with actual TDC. I am assuming there is an aftermarket crank to get you to the 331?
I have heard that some timing lights will read wonky with MSD, but I have several different lights, and they all function perfectly with every MSD install I have ever played with.
I'll keep brainstorming...
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No left turn un stoned
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