Caveat: From a guy who HATES carbs!
The real question is: What vacuum lines on your engine are un-connected?
Almost all ports on a carb reflect either manifold vac or air-flow
through the venturi's.
And noone should be tuning a carbed engine without a vacuum gauge..
Hook a vac gauge to the port, does the vacuum increase or decrease as the
engine is put under a load and throttle opened?
My thoughts: just cap it off
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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