The new Street Demons are essentially updated modern Thermoquads. Way better calibrations than the ancient CarterBrocks and several additional design features that the CarterBrocks don't even have. One cool design feature; the carbs have both bolt patterns so that they fit both the square bore and spread bore intakes. I have installed enough of these now, that they are all that I use on stock and near stock engines.

Available in 625 and 750 CFM versions. Lots of YouTube videos. Here's one:

www.youtube.com/watch?v=TRpmtLb_9dI