If you are building anything but a hemi and want a multi carb setup, the six bbl is the way to go. As Chryco said, if all you care about is performance, I'd stick with a single 4 bbl carb. If it's a hemi you are building, it's gotta be dual quads! Hemis just dont look right with a single 4bbl IMHO.
Six pac setups have a very unique sound when they open up. That sound of LOTS of air getting sucked into the carbs is awesome.
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