Re: 68 L78 Holley vacuum advance question
The distributor was set up with emissions in mind. Take it to a shop with a distributor maching and have it set up with a performance curve. Lots of easy hidden horsepower to be had.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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