Sounds like there is a Holley under the AFB skin!! LOL.
Is the choke adjusted correctly? Check the power pistons are not stuck in the UP position, check jetting if the carb history is unknown. Check the float level; Carter publish a chart that correlates fuel pressure to float level & needle & seat size. These factors effect final float level & are all interrelated. Also make sure the vacuum advance is connected to manifold vacuum for best idle quality & fuel economy.
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