318 Gas mileage?

Something is definitely wrong. My 360 with a much bigger cam and 750 Holley and 3:55 gears get 10-11 in town and 14 on the road. There are alot of good suggestions here. Dial in the timing curve and make sure you use the vacuum advance. Read the plugs and jet the carb as needed. Also the gears may be loading the teen too much and causing worse gas mileage in town. But usually down the hwy they don't hurt it.