67 dart emissions

SINCE the emissions laws have been pointed out 30 times in the thread.. MAYBE it's time to move past that point and actually help the guy - especially since he hasn't responded

The motor is obviously running rich..

Is the motor stock besides the 4bbl/360 heads? What carb does it have? A good tuned engine will likely pass - OOTB carbs need to be tuned period

1. check your fuel/ignition/exhaust systems for less than nice parts- replace less than nice parts if necessary - be sure your ignition system is up to par (gaped plugs, cleanish cap and rotor, ect..)

2. check the initial timing (disconnect the vacuum advance hose and plug hose- (VA)

set it to 10-12* like suggested - to check total timing - rev the motor to 2,500rpm or so

IF the motor don't have a VA or it don't work (plug up the hose)- set total timing to suggested 34* @like 2,500rpm

3. tuning the carb idle settings depends on the carb (Holley/Edelbrock)- but you will need a vacuum gauge that reads over 20"hg - with the engine running-

Set initial/total timing, set idle speed to 750-800rpm, check for vacuum leaks (I spray brake cleaner around the carb ports/intake gasket/ports areas), hook vacuum gauge to direct manifold vacuum- engine running- write down the vacuum reading you get just starting it after doing above.

shut the motor off - count turns on the mixture screws turning them in (be careful not to damage the seats when they bottom out) write down the turns made (I do 1/2 turn at a time) NOW turn them out 1.5 turns- that is your base setting

NOW start it back up - if it don't start or idle on it's own turn them out another 1/2 to 1 turn -while the engine is running on it's own now- read the vacuum gauge and write it's reading down- now adjust for the highest possible hg(vacuum) reading you can get - just be sure to adjust all mixture screws the equal amount

report back after this stuff or if you have trouble with this stuff