BTW - I'm no carb guy -- but I thought that the air bleeds (not to be confused with idle fuel adjustment screws) were there to overcome big azz cams that just couldn't be tamed with the idle screws. Since we know that carbs work via vacuum (actually low pressure in the ventures) -- any source of vacuum (air) leak is going cause you to have to fatten the idle screws and is going to also cause a higher idle.
Might just try to plug them temporarily and see what happens to the response and idle adjustment??
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