Question about a connection on my carb

I took off the air cleaner to clean it up and paint it. I noticed a connection (see my finger pointing to the connection). This short line was and is not connected to anything. I am thinking vacuum hose, but if so where should it connect? The car seems to run fine just as it is. Need some comments. By the way I have no idea what kind of carb. this is.
Thanks, rsh1966vip

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Author: rsh1966vip