1965 Carter 1 1/4" BBD Carb. 1 barrel question

that hole is a vapor vent hole. it is to let fuel vapor out, so it doesnt flood on the next start up. do not plug them. warrning: on the back side is two long screws that go throu all 3 castings. do NOT over tighten them. or the castings will warp. tighten them just enough. a 1965 has only one emissions part. the PCV valve.