in theory, you could run dual carbs on an h.t.
if the nt carbs are 14.5 mm, you could drop down to carbs that are 10 mm.
then you could re-jet them leaner than stock.
the 2 carbs together would be 20 mm, and with the righ jetting, it could work.
2 carbs always LOOKS better than one in my opinion, and even if it were just for looks, it would LOOK way beter than a single carb.
I have even pondered the idea of making a dual carb intake and putting dual nt's on it, and then block one of the carbs off so it's just for looks.
the blocked off carb would need a cable, and a fuel line going to it, but that would be really easy to do.
Making the intake would be the tricky part.