i ran 6paks for many years. had several sets. tried every carb combo i could my hands on. they will make power, but i've moved on. i run a ch28 with two 600's on one of my 440's and am very pleased with the low maintenance and excellent drivability i think the 6pak may have a small power advantage due to a little better flowing intake, but the 6pak doesn't make power as smooth as the quads, and i think the quads might have a torque advantage or at least a smoother torque curve.