Not only do SB mopars like cfm as my stock CR 340 did (850DP+2/10ths over a 750DP).. we had a well known racer with a Mk1 Ford Cortina running a Rover 3500c (215ci buick V8) stick car, lots of rpm etc. He amongst all the other racers kept on about my 850 carb being too big, so I persuaded him to try my 850 straight on his little 215ci motor,.....result.. 2/10ths faster, he couldn't believe it, throttle response wasn't as good as his 600 carb of course but I proved a point to them all back then in 1984.