You're thinking right, hutch08. Ace, you want to keep in mind that if you go from a butterfly carb to a carb with an unobstructed throat, you're effectively increasing venturi area. Some full-race 750's mount carbs as large as 38 mm., but no power advantage is seen before around 7K rpm, and that's gained at the expense of low-end and midrange power; 34 mm. is a common choice for tighter, slower tracks and TT, and 36 mm. is a common choice for general use.
The key factor is the strength of the vacuum signal--the larger the venturi, the weaker the vacuum signal to the carburetor. If you want some "serious shock factor" you'll want fast throttle response, and you won't get it out of an oversized carb. Think reasonable venturi size, accelerator pump, and high compression. The TM36/68 Mikuni flat slide pumper is a good choice on a modified engine.