My old carburator is getting tired and I'd like to buy a new one. It is for my street driven 72 chevelle. It has a 350 with vortecs and a comp cams 268h cam, edelbrock dual plain intake, headers, 40 series flowmasters, and 3.55 gears. It is just a a street driven car that doesn't see track time but I want a carb that will get me performance with out sacrificing too much gas mileage. Demon, Holley, or edelbrock?