That appears to be a ported vacuum source. I'm not positive because I don't know that specific carb setup. Not unusual to have it plugged if you have no need for it. Why they would do it with a long hose is another story. It may have gone to the distributor at one point. I suspect that the line directly on the manifold right in front of it may be going there now?
The big fitting on the back usually goes to the brake booster. Where is your booster getting vacuum from now?
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Greg Reid
Palmetto, Georgia
 
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