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to clarify my comments, the carb i specified is "progressive". This means one venturi is for idle, off idle, and part throttle. the venturi is relatively small, so exact metering of fuel to the air flow is easy for the carb to regulate.
when you want more power, the second venturi opens up which is setup richer to give more power and more air flow.
Constant velocity carbs are fairly notorious for being very clean, and make a lot of bad emissions. further, they do NOT get very good mileage in most applications.
Further, almost always the variable venturi carbs are side draft which makes them hard to mount to most automotive engines.
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