Hello all, I also have a 67 Firebird with A/C, and I have a question as well, what I am in need of is where the vacuum source is for the Vacuum Canister on the Firewall, behind the Left Fender? I have figured out all the other Vacuum Lines, have everything ready, but do not know where the original vacuum source hook up is on the engine for the Canister, my car is a Convertible 400cid, 400THM, NON Power Brake car, I have a Carb bolt that has a vacuum port on it that I assume is for manifold vacuum, I have the port on the front right side of the Carb for the Vacuum Modulator on the Trans, and I have one last port on the front bottom left side of the Carb that I assume is for my Distributor Advance, the port at the base of the Carb that would be for the Power Brakes? has a plug in it. The A/C Vacuum line to the Canister was removed before I owned the Car, and I have just finished redoing all my A/C stuff and looking for the final piece to the puzzle on it, I am not sure if the Carb Bolt Vacuum Port is for the Canister, or if I have to put some sort of screw in port in the base of the Carb for the Canister. If anyone has any Idea of where it should go, that would be great. Thanks for your time.