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The 38/38 DGAS (synchronous throttle plates) that I ran in my built NAPS-Z 2 liter did have a slight amount of rich smoke and sooty deposits in the tailpipe. However, when I jetted it down (it was originally set up for a 4 liter Jeep straight 6) it ran like poo and wouldn't idle until fully warm. Tensandtwenties has that same carb, with the original jetting, on his 510 (1600) with an L-20b. It smokes pretty good on that engine!
But then again, I'm comparing apples to... well, much bigger apples! To answer your question, Unfamilia, I have not really noticed a rich smoke problem with a 32/36 when I run the jets the way it comes.

As for the parts counter guy, he's been selling Weber stuff for quite a while. But I did say he might be full of it! It is probably a case of what all of you have said, they WILL run with the factory jetting, but it IS a compromise. He's also a V8 man, they might be more forgiving of a mis-jetted carb.