Generality: an annular booster provides a stronger signal and will deliver more accurate metering at low air speed, and a cleaner transition to main metering without excess richness.
That's pretty much the exact opposite of what my last annular combination did on the street; it came up on the main circuits too quickly during part-throttle street use and drove like a pig compared to the downleg config I compared it against.
I'm hoping my tuning capabilities are better the next time I run 'em, though. I'm still interested in seeing if I can get a big venturi annular 4150 to work for me.
