help! i dont want a ricer

I've got a 318 in my valiant and I haverage 17-18mpg, when I was in highschool I had a /6 '72 dart. I put an electronic ingition, ele distributor, and a 2 barrel intake/carb and found with that I didn't want to keep my foot on the gas as much. plus when you get the 360 you can sell the /6 parts and recoupe some of your expenses