318 Carter BBD 2bbl Replacement Question

Uncap that bowl vent; leaving it capped will cause hot-start/hot-idle difficulties. Either connect it via hose to the "CARB" (or "BOWL") port on your charcoal canister, or leave it open to the air if your canister is absent or faulty and you won't be replacing/fixing it. The other line to the canister (under the bowl) is the purge line.