Motormind, that doesn't always work quite like that. Yes, when forcing air through a smaller orifice, it does move faster. But air being pulled(suction) can only go as fast as it is pulled, and is limited by the smallest point. In other words, you can't "port" the carb and expect increased performance if the head isn't ported.
Of course, a turbocharger would change that. Then, you are forcing the air/fuel, and suction has nothing to do with it anymore.