67 dart emissions

So far as I'm concerned you guys in AZ should band together and start a class action lawsuit against the state. NO 67 or earlier car was ever speced for emissions except for the few 66/67 cars that were destined for sale in CA. In the rest of the 50 states, FEDERAL smog did not exist on any car until 68, except for PCV which was all cars around 63 or so.

In other words the state is trying to require something that never was

Having said that, get the engine good and warm, retard the timing some, and set the idle with a vacuum gauge or tach for highest RPM or vacuum, then equally turn the screws in (cw) about a 1/8T at a time until the vacuum/ speed just starts to drop.

If you can, find a friendly shop that will take a sniff at your tail pipe