He's a cb400f guy. Did a set bunch of 400f carbs, and a set of 550 carbs, but not sure they(the 550s) ever got run. He was not interested in cb750 carbs, at least he wasn't, when I spoke with him 2 years ago about it. He wasn't keen on doing all the work in making new jigs, patterns, trial and error on carbs that he is not familiar with.
George