[Bart Carter]

If you set up both carb and efi right, there is no difference in power output. The difference would be in driveability, with the efi far ahead.

Most people don't set up efi for max performance. They usually use runners that offer good velocity (smaller cross section for low to mid-range performance) and neglect the need of a larger cross section for peak HP. There is a balance there that you have to decide on and then build accordingly.

A stand alone system such as Autronic, F.A.S.T., MoTec or Redline can be tuned to anything you want.

Of course, you also need a tuner that knows what he is doing.