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Reply to "Size Carb."

My cam takes most my vacuum. 310 duration. My carb is a 780 holly w/ vac. sec. I need vacuum for brake Booster. So, when I stop at stop light she dies on me. When I start it up alot of black smoke then clears on takeoff. I was told I need a Mechcanical carb. About 750 douible pump.
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