That cfm surprises me, on the dyno we ran my Quick Fuel 950, and also a well known dyno carb Quick Fuel 850. There was a significant power difference, even the engine builder was very surprised. I will have to check my dyno sheets again as it's been a while, as I recall it was down 20hp with the 850. Keeping in mind these are box stock Q series Quick Fuel carbs with only jetting changes, not a custom built piece such as you have ordered. I'm sure they know what they are doing.