I've not gone down that path, but I can't imagine why two pumps would be needed. What you will need is a pump that can supply more pressure than Max Boost + the carb's max inlet pressure at the GPH required. An EFI pump will handle the psi requirement (assuming less than ~35 psi of boost) and I would expect that it could handle the GPH requirement but I don't know that for sure. You'll also need an FPR that you can boost reference. Can mod a Holley by-passing type regulator to do that, but unless they offer such a critter it will be a simple pair of mods rather than an RTR off the shelf solution. I am using a by-passing type Holley on an NA engine and so far I'm not impressed. Might be the pump, but it's inconsistent about fuel pressure. I'd look at other offerings, perhaps Aeromotive or SX?