I pretty much hate SHA carbs on kitted or modded bikes on any occassion or setup. That motor that I was running finally lost all compression and was the saddest thing ever. My last trip on it was 100 miles long by myself when I moved from Louisville to Cincy and it used an entire tank of gas in about 45 miles. I'll rebuild it faster but it's going to be a minute.
The best carb for a moby is still the stock carb. Runs better than any SHA will ever ever. And you can still do over 40 on it. With all stock parts. And an airbox. Fact.