The metal line for the vac mod should be connected to the carb vac tree right on the top, you can just barely see it in the diagram posted, but what youre looking for is a tight bend in the metal line with a small piece of rubber that connects to the top port on the carb vac tree.
If its missing or damaged you can buy a similar size of brake line or tubing from a auto parts store & bend it to fit... or as a last resort you can use rubber reinforced fuel injection fuel line there that will work temporarily but metal is best.
You can also remove much of the vac lines related to emissions like the charcoal canister, EGR valve (use a block off plate) and also remove or gut the smog pump will free up a little drag on the engine... along with that remove the catalytic converter to free up the exhaust and get some good free flowing mufflers. That is if you dont care about those emission items or dont live in a state that does testing... or if you dont care about originality of the car & want a little better performance.
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