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Post a photo of what your rear metering block looks like and that could tell a lot by seeing it. If the rear metering block does not have the same emulsion ports like the front and same idle feed restrictor setup machined into the metering block then it would throw the secondary fuel curve off on the secondary side and cause some issues with mixture and stuff.

If the block is the same style metering block used in the Holley 4150 series carburetor for street use then it should be ok but I would at least want to check the emulsion port size to see if its matched with the primary. Most are .028 and have two emulsion port holes each side and one kill bleed each side.
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