AC & Heat Vacuum Source?

[70GMCer]

The PO disconnected the vacuum hoses from the engine that controls the heat/ac controls on my 83 w/305 engine.

I'm thinking that I need a vacuum port connector on the intake manifold at that plug near the rear of the intake next to the carb. Is this correct?

Anyone have a picture of that vacuum port connector or part number?

Then, that vacuum connector hose would connect to the vacuum canister that is on the firewall next the heater/AC housing. Is that correct?

I've already checked all of the actuators with a vacuum brake bleeder on the inside for operation & there doesn't seem to be any leaks.

Just trying to get all the parts needed to reconnect the heat/ac controls.