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

Garrett Ellison said

On American ‘71 ChryCo cars, carb bowl vent went to a three nipple breather on the passenger side valve cover.

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THIS. I don't believe there were any valves, etc, just an open breather with extra nipples. Big one to air filter, (for pvc), one went to the carb bowl, I don't remember the other one Go to MyMopar.com and download the 70-71-72 service manuals and read the carb/ fuel sections and the emissions chapter in the back

That stuff changed every year, may have changed in some mid years and was a little different as things went along