I know what ported vacuum is I just could not understand the comment as written, even if trying to be sarcastic. I do not know for all cars, but the Carter AFB pre emission were ported. I do believe that all Chrysler were like that as they had a different approach for emission/CAP for their cars at least in the 60 and early 70. So ported was not an emission thing. Chrysler chose to use vacuum advance to control timing on load, and chose to have idle run with no vacuum advance.

In the true cap years starting in 66 for Chrysler CA only. And 68 for all states, they did use the Vacuum canister for 4 speed cars to switch to Manifold vacuum during deacceleration only. Cars were tuned for lean idle and retarded ignition. Even the hemi starting in 68.