Carbon canister

If you want to know how it all was without any guesswork, get a copy of the CHRYSLER factory service manual for that year. It shows every vacuum diagram for every possible engine combination. Federal, California, high-altitude, etc.

I don't have a copy for that year or I would provide it, but there's only 3 vacuum-related subsystems on those.

1. Charcoal canister. 1 vent line from the tank which is a hard metal line, 1 rubber vent line to the vent on the carb airhorn, and one rubber purge line which goes to a vacuum fitting on the front baseplate of the carb. Your carb appears to not have a bowl vent, so you have the tank vent line, the purge line to the base of the carb and the CARB port on the canister is capped off with a rubber cap.

2. EGR. Very simple. One line runs from a ported vacuum source on the carb up to the coolant temp switch on the radiator tank, out of the switch and back to the egr valve on the intake beside the carb. The temp switch is to prevent the egr from functioning when the engine is cold. That's the two thin lines with one connected to the bottom front of the carb. One should have a white stripe on it. Originally they ran along the upper rad hose and were secured to the hose with a metal band.

3. OSAC valve on the side of the air cleaner. Orifice Spark Advance Control. All it is, is a valve that momentarily delays the advance signal to the distributor. The smog-device haters claim it reduces performance. On a mid-70's 318 performance is already reduced and I've never noticed a difference with it in place or bypassed. One port is marked CARB...guess where that goes. The other port is marked DIST...guess where THAT one goes.

4. The thing on the underside of the aircleaner with two ports is the thermo switch for the flap in the snorkel of the air cleaner. one side gets fed manifold vacuum vacuum, the other goes to the flapper valve.

Good luck, it's not quite rocket science:D