I'd suggest an 8-ounce ballpeen, and hit it medium-hard on the float chamber. That will do about as much good as any adjustment you could attempt. The only thing that's adjustable on that, or any modern carb is idle mixture. Evervthing else that affects mixture is deep down in the works, and is not adjustable, things like main jets, air bleeds, metering rods, etc. As the altitude goes up, a carb runs richer due to the thinner air, and a leaner main jet or a larger air bleed would have to be installed to compensate for the lighter-weight air. An ideal air:fuel mixture ia 14.7:1 BY WEIGHT. Aircraft carburetors have aneroid-type mixture compensation for just that reason, or they have adjustable mixture for altitude compensation. Cars don't have that option, unless they have computer-controlled fuel injection. You might be able to lean out the idle mixture for a smoother idle, but that's all you can do externally.
Jerry
