66 valiant a/c and heater vacuum valve

Okay, my nephews '66 valiant with a/c originally. So here is the issue. The heater core has been bypassed, assuming its a leaker and the reason it was bypassed. The heater core swap is straightforward, and the running of new hoses. My question is this there is two additional brass colored garden hoses sized fittings from the firewall. What are they? Do I need to plug them off to keep the heater core from leaking there. I'll add pics of it. Secondly what's the vacuum pump on the passenger side inner fender? Is it for a/c only or is it to operate the heater core? Again I'll add pics soon. Thanks.