[joedeats]

In most dyno tests I have seen a well set up single carb will almost always equal dual carbs with alot better drivability. Look into demon carbs as they have been shown to be a tad better in the hp field than holleys. If you do the math for your engine 514 cubes, max rpm 6000 and a volumetric efficiency of 90% you only get about 800 cfm needed, a good 850 cfm vacuum secondary carb would make you a happy man. But then again what works and whats "sexy" are two different things dual quads look great but are a pain to set up, where as a good sinlge quad carb with a vacuum secondary would actually be much more enjoyable on the street.