1970 DUSTER 440 4spd 8 3/4 posi

the discharge nozzle is what squirts the gas in at 45* angles into the fron 2 bowls. it has a big phillips head screw holding it in. for vacuum, find a vacuum plug below the throttle blades, usually in the front under the fuel bowl. that has constant vacuum @ idle. put a vacuum gauge on it and it will tell you what kind of vacuum the engine is producing. the power valve is in the metering block behind the front fuel bowl.