318 drinking gas like hell

hey have a 318 in my Dodge van that drink much gasoline,
it's a carter 600 cfm on the engine, with 395 nozzles in the primary ports, and 385 at secondary ports. I have tried to put in 385 nozzles in the primary ports but then it spits and spark slams only and runs really bad. it's a new distributor on it hei style, set on 12 degrees. it consume around 0,76 gallons on 6,3 mils

help me to make it drink less gas.
sorry for my bad english