[GTO-relic]

flow rate capacity for Rochester carburetors, including monojet, 4G, 2G, Qjet.
the handwritten numbers for 2G are flow at 1.5" to compare to a 4-bbl at equal pressure drop. Unless you're using a '66 tripower intake with the big 2bbl carbs, the early tripowers with small center carb really aren't worth running, unless it's a numbers restoration or show car. A single 800 Qjet, or 850 Holley flows the same, or more- and is a lot less maintenance and complexity, more equal fuel distribution, and better intake runner layout. With the availability of 1000cfm Holley carbs based on the 850DP, and Dominator carbs, there's really no reason to run any tripower at all- except for nostalgia, looks, the sound, or the hell of it cuz it's there on your garage shelf.
regardless, if you run the '66 tripower intake with the 3 big carbs, it'll have 900-920cfm total capacity...measured at 1.5" HG like a 4-bbl is.
the downside is, eventually rebuilding 3 carbs instead of one, and the tangle of fuel lines, progressive linkage.
20+ years ago a friend from Detroit area obtained all the flow numbers for various factory and aftermarket intake manifolds, connected to a head on the flow bench.
the tripower intakes actually flowed very poorly. the vintage aftermarket intake manifolds flowed pretty lousy as well. the best flowing were the Victor, Nash/Warrior, Torker II, Performer, RPM, Street Dominator, Torker 1, and GM iron 4bbl 1967-74, more or less in that order.