Hooking distributor advance to intake manifold port.

RustyRatRod said

That's how the Carters and Edlebrocks are. They do not have vacuum at idle on either port.

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My 1406 does.
It has one ported and one manifold, and the manifold is the only one with vacuum available at idle.
Ported is on the left and above the throttle plates, and manifold is on the right below the plates and has idle vacuum.

I just recently went through the whole thing to replace my adjustable vac can and adjust it so I am positive about it.