[blykins]

A lot of the above...

Sometimes a slow timing curve will make a car seem doggy until it gets going. Other times distributor issues, such as stuck weights, condensation/moisture under the cap, module issues, etc. can be masked as carb issues.

Any time there is a stumble when you mash the gas, a lot of people first point at the carb, whether it be a lean issue, trash in the bowls, etc., but it can be other things as well.

There's nothing necessarily wrong with a dual carb setup. As some of these guys attest, they can be easy to use and will perform well. Another HUGE variable that has a bearing on this is how radical the engine is. If it's a 425hp engine with a mild cam and a dual plane intake, then it's going to be easier to mess with than a 600hp with a large overlap camshaft and a single plane intake.