318 hesitation when cold

You need a manifold vacuum line to the nipple on the base of the air cleaner to activate the hot air door. Look for a plugged vacuum nipple near the bottom of the carb. Also, the long vacuum nipple on the right side of the carb by the choke linkage should be connected directly to the vacuum advance on your distributor (worth a few MPG). As for the plugged bowl vent on the top of the carb, I would just leave that open unless you still have the charcoal canister to connect that to.