Just to add to the information above, you are not limited to a Chevy style Q-Jet. Permissable are the ones for Buick, Olds, and Pontiac as long as they meet the venturi and throttle bore dimensions as Chuck said. I reccommend to my customers that they stay away from 1968 and earlier Quadrajets because these use a large float which decreases the bowl volume. The "hot ticket" lately is a rare Pontiac Q-Jet that was available only one year. They are rather pricey if you can find one. I have a number of racers that will be testing these this season so time will tell if they are worth the extra expense. Danny
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