I don't care about performance I have other cars for that but I have a 318 2 barrel and 833 od tranny but I don't know what kind of gas mileage I could get
This would be my vote, but the 318 would need some work like the better 302 heads raise cranking psi to whatever reg can handle maybe 150lbs, maybe a aluminum intake with a small 500 cfm carb, headers,