Re: Engine runs way too rich!
Do you have a filter on your carburetor? That will cause the engine to run correctly at idle and low rpm but will cause it to run rich at higher rpm.
The GAV is a tool to adjust the carburetor while driving. Open it up a little when warming up the engine and close it down when warm. When driving at a constant speed over the highway close it down more or even shut it off completely. If the engine starts to falter or miss then open it up just enough so that it runs smoothly. You can open it up more for in town driving or pulling a grade. If the GAV is not controlling the mixture then you may have the level in the carburetor too high or an air jet is clogged or too small. See https://model-a.org/default.html.
Once the air/fuel ratio is correct the soot will burn off the plugs and the rest of the engine.
Another thing that can cause poor mileage is a cold engine. Do you have a thermostat to keep the engine at the proper operating temperature?
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