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If your idle fuel mix is correct(air and fuel bleeds) any carb will be responsive. It has to be rich enough, at idle, so there is a good transition when the main circuit opens.A 10 or12 to 1 ratio is what I start with and if right no acc. pump is needed. Read one of the old Holly carb books. Every carb has to be reworked to each engine combo, vacume signal, to really dial it in so it's responsive.

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I've found just the opposite to be better on my cars and carbs, 14.8 or leaner at idle and part throotle cruise and 12.8 to 13.5 at WOT, depending on fuel being used and altitude being driven at. A lot of the Holley carbs, especially the race ones like the D.P. and Dominators, are real rich at idle and part throttle like he stated, that can and will foul the colder hear range spark plugs and possibly wash the cylinder walls down and dry them out OP, you might want to invest in a wide ban O2 kit, they can be a real help on tuning the carbs or EFI, especially when you get real close to perfect