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Thats what ya gotta synchronize! Does the linkage have a drop rod with little ball sockets on each end connecting the throttle on the carbs to a crossbar between the two carbs? The idea is to change the length of the little drop rod between the ball jionts on the "high draw" carb to reduce it's vacuum to be equal to the other one. You may have to increase on side and decrease the other. On my car with 40 IDFs, the rod has to be shortened to reduce the opening of the carb. One side of the drop rods is often reverse threaded, so one could theoretically lossen both lock nuts and turn the drop rod to raise or lower the amount of travel before the butterflies open. That is an OK way to get close. On my car, I can only get a close balance if I take the drop rod off the carb and cross bar and adjust it in tiny tiny tiny increments- on the car, test it, off the car, adjust it, on the car- test it, off the car- etc.
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