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I have this qft (guessing 650cfm) vacuum secondary mounted on my 350sbc victor jr s8ngle plane, and 1in 4 hole spacer, low end throttle response and hesitation was gone with the spacer, but its always had a lil midrange trouble, lets say im cruising and I snap open the throttle it hesitates for a sec then drops like a hammer and takes off, top end seems fine, whats possibly my issue (not sure the exact carb model) and i know the single plane isn't helping, going to a swap meet this weekend to try and find a cheap dual plane airgap. Thanks for looking! Last 2 pics are before I cleaned up the engine bay and added a spacer