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

I haven't seen a lot of Holleys on cars over here, usually Carters. My '78 Dodge van had a stage ll truck engine, which was a truck Holley 2-barrel on an LA 360, Leaded gas. Sorry, can not remember where that vent went, but it definitely didn't go to a valve cover breather, not in my application anyway.
Having said that, truck stuff is usually different, the air horn is larger also.