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Four barrel Carb swap ( need Imput)

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i have a 72 240z with a pair of SU's in it right now. Ive been having a lot of trouble with them so i was thinking about getting the intake manifold from AZC and putting a Holley 390CFM on it. Will this preform better then the SU' or is it going to be worst then the SU's. Just looking for some feed back.


Thank you

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