Holley 4779 750 cfm Double Pumper

HSDemon.
News flash for you. Every carb, Holleys, QJs, Carters, Edel etc all have plenty of fuel from the idle cct for a rich idle.
The idle cct jetting is not sized for idle, it is sized for transition; transition to the main cct.
Transition requires MORE fuel because more air is entering the engine. The idle & transition cct are all part of the idle cct & connected by internal passages. The problem then becomes how to reduce the fuel to the idle port because it needs less fuel. That is what the idle mixture screws do, regulate the fuel+air for engine idle. There is always enough idle fuel provided the throttle blades are correctly positioned in the bore, ie about 0.020-0.040" of T slot showing below the blades at idle.