Theoretically 50% increase in power. Probably over 100 hp. You can safely use stock hyper-eutectic pistons then, but you really do need a good ignition retard. If blow through, you will need a variable pressure fuel pump to push fuel into the carb against the boost and you can use an inter cooler although for 8 PSI you won't gain all that much. EFI isn't a simple as that. These systems are simple and can't supply much more than stock displacement requirements. A 1.5 liter at 8 PSI will 'look' like a 2.3 liter engine for fuel needs.
So as far as getting enough fuel to efi, I need a strong fuel pump, and injector(s) able to push enough fuel so that the mass air flow sensor can tell the CPU to dump
More gas as the RPM's increase and the turbo spools?? Or is that not a correct assumption?