getting ready to drop 440 into dart/duster. eng is .030,10.0/1 comp,bullet cam that is 271 adv and 242 at .050 with .548 lift. has open plenum intake. trying to decide between demon 625/750 or holley 650 dp. carb charts say approx 670 cfm. any thoughts? i don't have any experience with street demon carbs. thanks in advance.