I'm putting an Eldebrock AVS carburator in the el Camino and find one area of the instructions confusing. There are two distributor vacuum ports on the front of the carb. Facing the carb, the instructions say the one on the left (passenger side) should be used for emission controlled cars then later on it say it's for a full vacuum advance distributor. The say the one on the right (drivers siide) is for non emission control cars. My engine has a hose running from the valve cover to the air cleaner and has a GM HEI distributor. Any idea which side I should be hooking up to?