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Fuel comes out of the boosters before it come out of the bowl vent.
If it ever floods enough to come out of the bowl vent, it will certainly be pouring out of the boosters.
I would look at any rubber hose after your filters, pre carburettor, since line degradation failure ends up causing this.
Also look at the float tang that operates the needle and seat and the needle tip for any burrs that will jam the needle sideways and not allow normal up travel.
I am converting a few of my carbs to floatless, external adjustable fuel height, baffled (sloshless), runs as a return system.
Similar principle to others around, without the hiccups, or the extreme cost.
Gary
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