Well I run a little of everything on my rides a Holley on two of them, a quadrajet on my 71 Chevy truck an Edelbrock on my Scout and fuel injection on my Ford. I think other than fuel injection which would probably do best for milage, the next best carb would be the q jet and I would use the one that is on it. You can always change jet sizes and metering rods until you get it just like you want it. Mine gets great milage compared to my others. As long as I keep my foot out of it that's hard to do sometimes.