I use three Weber 32/36 mm DGV two barrel progressive carbs. They were used as performance replacement carbs on 2 liter foreign and some US cars. I have seen flow rate figures claiming 150 to 250 cfm for these carbs. The sit on homemade tubing bends that gradually taper down from the two barrels into the single intake port. Each runner feeds two cylinders. There is a one inch rubber hose between each runner. The setup idles fine and milage is good as the Webers run on one barrel most of the time.
Thanks for the question.
