between my carb and the firewall on my 82 351 there is a metal component attached to the intake. it has some vacuum ports (four i think---) that all point to the top of the engine. one of the ports does not have a hose on it. i am hoping someone will tell me the name of the part and it's function as that will help me try to figure out if it should have a hose connected to it . thanks for any help offered.