How do you adjust fuel mixture on a rochester quadrajet carb?

To adjust the fuel mixture on a Rochester Quadrajet carburetor, locate the mixture screws on each of the primary side throttle bodies. Turn the screws clockwise to lean the mixture and counterclockwise to richen it, making small adjustments while monitoring the engine's performance. Ideally, adjustments should be made with the engine running at idle and using a vacuum gauge or exhaust analyzer for optimal tuning. Always make incremental changes, allowing the engine to stabilize after each adjustment before proceeding.