Need help with a fitting on a Holley 2 Bbl carb, please.

No charcoal canister on this car, but I think it may have been deleted when car was repainted back in the late 80's/early 90's (forget what Bazza told me), as I found all sorts of wire "bristles" (evidence of hole-plugging?) on the underside of the inner fenders when I was putting the front suspension back in.

Then again, the gas tank only has the one fitting, and no vent connection (nipple). Hmmm...

You kinda lost me here, though:

Seems like a contradiction to me. I may be a little daft (long damn day), so should I cap it, or leave it open?

Thanks!
No, what I am saying is IF the carburetor has a bowl vent "somewhere else" besides that nipple, you can cap the nipple off.