Depends on the other parts on the motor.Mine is a 306 with Edelbrock performer heads and 1.94 valves. Heads are box stock, Motorsport "B" cam, and AOD trans. I picked up 3 tenths on motor, changing from a Torker II "straight carb design" to an RPM air gap..
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When the people fear the government, there is tyranny. When the government fears the people, there is liberty.
Thomas Jefferson