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ACMJG is correct. I had exactly the same problem when I first used a pair of #8007 390 cfm Holleys. Follow his instructions, remove the carbs from the intake and then remove the base plate being careful not to damage the gasket. Back off the idle screw and slightly loosen the brass screws that retain the butterfly plates to the shaft and jiggle the plates for the best seal. Then replace the base plate. I did that to both carbs, all for butterfly plates each and it solved my problem. Also, while the base plate is off, check to be sure that the butterfly plates are installed with the correct side facing up. There is a top side and a bottom side to the butterfly plates. The edges of the plates are at a bevel, not cut perpendicular to the plane of the plate. The bevel allows a better seal when the plate is fully closed. If the butterfly plate is installed upside down, it won't seal correctly. I found one plate uinstalled upside down and had to correct it when fooling with my new Holley carbs.
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