I sprayed 200hp through a single nozzle before the t.b. on my old combo this year, and the kit (NX EFI Race 20113) is adjustable in 100-150-200-250hp increments.
Also, NX makes a plate for the Victor 5.0 intake, as I will be stepping up to one in the future.
I'm going to start with the kit I already have once I get the new motor together, and add the plate later to make a two stage system.
As for fuel supply, I went off one side of the Paxton universal EFI regulator right to the solenoid. I run a line from the pump to a -8 NOS Y-fitting with two -8's to the rails. From the rails, two more -8 lines to another NOS Y-fitting, into one -8 line that goes to one side of the regulator, so I had the other side blocked off until the nitrous system was hooked up.