There is only one mixture adjustment. It is in between the dist and the airflow plate. All it adjusts is the starting position for fuel delivery by altering the fulcrum lever point. This adjustment must be run counterclockwise till the fuel stops. This has to be done on your car (or at least on your airflow meter.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician