EFI -VS- TBI which one-good-best-better?

The voltage you refer to the system needing is not the “EFI” system it’s the fuel system. See information in the post above. I’m running a stock alternator and have no voltage drop issues but have modified my charging system wiring bypassing the bulkhead as described elsewhere.

Also as referenced above there is another thread on here about the ProFlo4 EFI with detailed pictures of rotor phasing. Edelbrock has not corrected this issue as they claim it doesn’t exist. You will have the issue above 3K rpm.

And one last observation, I can’t tell what type of coil you’re using but make sure the coil you have is on the approved list of coils as it will fry the ECU if it doesn’t meet the specs.