69 Barracuda heater control vacuum lines on firewall

I have a question reagrding the heater control vacuum lines coming out on the firewall.
Does anyone have photos or diagrams of what and where they connect to?

I tried searching other posts but couldn't find any that had 3 vacuum lines coming out, only those with 2.

I have a 1969 Barracuda with a 318. It is an A/C optioned car but the A/C system was tossed along the way.

Here are some pics of what I have to work with.