Recommended 4bbl carb for stock 318

<Holley Economaster 450 cfm Quadrajet>
I'd like to see a shot down the primaries; does it have a triple booster up front. Dang I coulda used that on my mileage testing combo; I bet that combo coulda gone better than 32 mpg. I even have a smallport intake I couldda slid under there. I was thinking maybe an old Offenhauser Dualport. Man I'd build a 360 combo just for those two items. Aluminum heads and 200psi, double overdrive and 2.94s;65mph =1270rpm,lookout!!