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.........actually a lot bigger. At our rpm band, compression, and cam, the motor can’t really benefit all that much from the excess cfm capability.. You may get a couple extra horses out of that carb st 4000 rpm but the vacuum signal to the carb will be less than a 600 and I’ve heard it can affect drivability. I actually had a bran new 750 that I sold for a loss in order to get a 600 for my killer 427 Lancer. However, if you have it you may as well try it.