74 Dart. Headers vs manifold.

72bluNblu said
... Even well tuned carbs aren't capable of the kind of consistency and accuracy that a decently tuned EFI system can give. .... It's not like a carb will hold your AFR at 14.7 all the time. Not even close. And that's where EFI improves mileage- it's about how consistent the AFR is, and EFI does a much better job on average if you look across the board.

I agree but you got to give a carb a little more credit than that. It can hold a pretty stable A/F ratio considering its in a static tune and has to function over a wide operating parameter. look at this QFT 750 carb on a Chevy 377. Not bad, not closed loop EFI good but would it warrant a $1000 change in mileage? Give it is on a dyno pull and not on the street......