2 bbl carb
Some carbs DID have an air adjustment. Older AFB 4bbls are one example, and not just on Mopars. They had one big screw "in the middle" that created an air leak, basically, to adjust idle speed, and then you would adjust the two idle mixture screws
Like this.........there is no mechanical idle speed screw (except maybe fast idle) there is the big one in the center (air) and the two fuel mixture, one on each side of it
Putting a 4bbl on a 2bbl manifold is more than silly and may compound your problem
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Some carbs DID have an air adjustment. Older AFB 4bbls are one example, and not just on Mopars. They had one big screw "in the middle" that created an air leak, basically, to adjust idle speed, and then you would adjust the two idle mixture screws
Like this.........there is no mechanical idle speed screw (except maybe fast idle) there is the big one in the center (air) and the two fuel mixture, one on each side of it
Putting a 4bbl on a 2bbl manifold is more than silly and may compound your problem