I had the same problem with my 750 DP 2 corner mixture screw carb. Eyes n nose stinging n watering. Idle AFR said low to mid 10's at idle. Plugs carbon fouled. Found the transfer slots better than 50% open, mixture screws unresponsive. Adjusted that , adjusted IFR's and IAB's and needed to add a bunch of idle bypass air. Mixture screws became responsive. Used the secondaries to tweak the idle speed. Idle AFR ended up in the high 13's, occasionally into low 14's. Exhaust still smelled a bit though.
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Frank M.
75 Firebird
68 Firebird 400 RAIII
66 Chevy II 461 Pontiac in AZ
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