How to route vacuum hoses to canister??

I will be trying to get factory AC up and running this week in my 74 Duster and need help on routing the vacuum lines. I pulled the 318 and AC components a few years back and installed a 5.9 Magnum minus the AC. At the present I have a small vacuum line coming thru the firewall near the AC connections, and I have the small plastic vacuum canister ( size of a softball ) with a small and a little bigger port. What lines are connected to the ports? Currently there is a vacuum heater valve but so corroded water flows thru in both open and closed position.

Thanks. Gary