It depends on the pump you use. If you go walbro or Supra, use the stock regulator and you will be fine. If you go for a pump that flows more, then you need a regulator that will flow more.
800 injectors are low-impedance (verify this before believing me by measuring the injector's resistance). Make sure you use a ballast resistor in the circuit or you will blow that AEM EMS. The AEM does not have peak/hold injector drivers like the Nemesis does.
Also, you might have a difficult time finding the injector offset curve for that injector setup. If so, drop me a line and I will show you a neat trick.
