I agree. Like I said, it's way more complicated. But I'm sure whoever's selling the 33 conversion is laughing all the way to the bank at the thought of how many people are buying his kit without putting in the extra work and expecting to bolt on horsepower when all they're really getting for 600 bucks is snappier throttle response. I don't want this happening to our TW brethren. Bigger ain't neccessarily better in our case.
All kinds of people read this stuff, and I'm not suggesting that you, or the original poster didn't "get it". I think it's important to explain that the advantage of the pumper carb is the pump, and that extra 5mm ain't doing a thing for ya.
Therefore bolting on a conventional carb of 36 or even 50mm won't do a thing for ya, so don't chase it. As long as it's jetted properly your motor is only gunna take as much air as it needs. For a carb to be "better" in our case it needs to bring something else to the party, like an accelerator pump, better fuel metering, overlap or altitude compensation, or jet availabity depending on what you're after.
I'm not saying playing with carbs won't have any value. If you want a flatside the smallest commonly-available item with a pump is a 33. What I'm saying is a 28 with a pump would do the same thing on our motors. Different brands and types of carbs all have their advantages and disadvantages, I'm just trying to explain why bigger alone won't neccessarily change anything. Since the 33 came up, and this is a carb discussion I'd like to dispel the myth about size because it's a common misconception. Humor me.
For the benefit of those less dweeby than I, I'm gunna risk an analogy:
Let's say that we as average humans are standing at sea level, and the earth is an infinite source of unrestricted air.
Our lungs have a given capacity (displacement}. No matter how blessed you may be, no matter how big your mouth (carb) and airway (intake tract) are, you can't take in more air per breath than your lungs (cylinder volume on the intake stroke) can handle. As long as your mouth isn't sewn partially shut (UNDERSIZED carb to begin with) most of us have an oversized "carb" from birth. Steve Tyler is prolly capable of 1,000 hp. But I digress.
Now let's train for a marathon and increase our lung capacity (boring, stroking, headwork, cams). If you're the poor guy born with his mouth partally sewn shut, you're gunna need surgery (a bigger carb). But the rest of us will still be fine because we had a sufficiently oversized "carb" to begin with.
Up to a point, that's a TW. All i'm sayin' is that I'm not sure you'll need a bigger mouth with typical mods.