Good info Jon, thanks.
Yes I've seen how they drive those things. And these carbs have a cult following in off road circles too so that logic holds water.
I already bought the pair so I'm gonna try one out just because. And then according to the info on here I'll probably end up ditching it. But either way I will report back. If I knew where to Dyno it I'd do a run with it and a standard carb to see the difference.