I agree on the idle mixture being too rich. Most of the 4 corner idle mixture carbs I've tuned have wound up in the 3/4 turn range. Just beware the 4 corner carbs are more sensitive. On my Holley 950hp 1/4 turn rich will blacken my plugs.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2,generic one inch open spacer
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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