Finding ones that are cosmetically nice with little corrosion inside and without a split overflow tube can be tough.
The only carbs on the CB/CL 350's that I'm aware of that use a totally different float bowl are the early carbs stamped 350 like the one shown in the photo.
The next carb variation uses float bowls with a smaller drain screw but these will fit the 3D and 722a carbs.
Pictured is my collection of seconds, the middle left shows a replacement overflow and the middle right show a split tube. One of them also shows a solder repair on a split tube. There is also one shown that has what looks to be hammer marks on it .... unfortunate as it has good internals.
If you are looking for perfect you will have to search out NOS, they used the same float bowl on several different bikes.
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