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I was taught by an old mechanic, (he had the "ear" to know exactly) on the engine side of your carb at the base of the carb is the fuel metering screw, turn it to the right until the engine slows and just starts to spit and sputter. Go back to the drivers side and increase the idle speed until...

Use a vacuum gage with a T fitting from the carb, adjust the timing for 21 in. vacuum, lean the carb until it just barely runs and then increase the idle speed until you reach 21 in. vacuum again. This is the ballpark for your engine running it's best, you can play with adjustments from there...