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Dylan;
If throttle linkages are doing the same thing at the same time carbs ARE (statically) synched! Don't be preoccupied by the fact that dashpots are rising at a different rate...rate at which dashpots rise (dynamically) is more determined by damping oil viscocity, clearances in dashpot tube and at the one-way valve. If they rise at a different rate, you can try swapping dashpots and domes between carbs in various combination until you get more even function, or even thickening up the oil in the fast one as a last resort, BUT I don't think that will solve a surging or miss issue, and it surely wont solve a mixture issue...I'd go after those first...how is your ignition, distributor, advance curve?
Short of having a dyne on which you can leave the hood open and adjust jet position while car thinks it's traveling along at speed with engine loaded, mixture setting is achieved by roadtests under various loads and speeds, checking at idle with lifting pin, adjusting idle, adjusting mixture, more roadtests, lather, rinse, repeat...until you get good throttle response, no lean bogging, and an idle which settles back decently...it's not so simple for a beginner, because the experience is not there to draw on...but stay with it...
Cheers
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