I don't understand this "bank to bank" thing. Carbs are not isolated on each bank. Using a 180* manifold, each side of the carb fires half the cylinders on both banks. Using a 360* manifold, the are STILL not isolated bank to bank.
It comes down to distribution issues created in the intake plenum/runners and this is why you will get a reading variation on the gauge from bank to bank. DP EFI mostly eliminates this.
