Fuel filter should be full, could be the gasoline vaporizing due to heat, thus showing up as 'air' in the filter. Or, fule pump may not be 'sucking' good from the tank, or supply line from the tank may have a minute leak. Is the filler cap vented?
Use a vacuum gauge to adjust carb mixture screws, and tune for max vacuum.
Check to make sure there is not fuel dribbling from the venturi boosters as you look down the carb body. If there is, float level is too high.
You might want ot try hooking the distributor vacuum cannister to manifold vac, sometimes, this helps, especially if 'bolder than stock'camshaft is used.
Check the accelerator pump is working when throttle is bumped.
Check to make sure there are no vacuum leaks, espaecially between carb & manifold.
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