I just installed a DC mechanical six pack setup that flows a true 1050 cfm or so on my 365ci sb it totally shreads the drag radials and revs up quick! I don't put much stock in that old cfm calculation better to use common sense.
Sorry, no 365cid will ever flow 1050CFM (but your carbs may on a test bench, one barrel at a time, then added up) Reason is it cant produce the vacuum to pull 1050 across 6 bbls. a six pack was actually rated closer to 770CFM on a 340. not dissing the motor, just physics. You get good torque because the velocity the 6bbls can produce. Read Vizard's "Super tuning carbs". Buddy had a Buick Wildcat with one of their large inch motors, it ran a 600 Carter stock! And it ran it very well. TQ's and AVS as well as QJ's and Predator all are demand carbs, forgiving on motor size, AFB's a little less forgiving and Holley Vacuums are adaptable with their spring setups. Holley mechanicals are hardest to dial in. 1200 CFM TBI EFI is another beast entirely, doesnt matter what it flows as it doesnt have to vacuum draw metered fuel.
