It sounds like there may be a slight vacuum leak - either the canister or hose. They shouldn't be that off from each other. BTW - if the headlight hinges recently rebuilt, they can be done easily. Everything rides on thin stepped plastic washers that get brittle. I rebuilt mine and lubes with anti-seize. Easily done. Also, if you look under the car, there should be small springs that keep tension on the headlight assembly. They may be missing or not hooked up. They're a pain.
69 RS Conv,355,M20,4.10's