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Look on ebay and the classifieds here for a used edelbrock DP4B intake. For stock heads it's all the flow you need. You won't gain anything except less hood clearance if you go with the performer rpm over the dp4b.

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the single plane Holley Street Dominator was the BEST dual plane intake ever made




The holley SD is a good intake, but not for a stock 383 with 3.23 gears.



whatever you say..