Considering I've had the same setup, I'd recommend 1000cc injectors and Dual Denso Fuel Pumps. That setup will be good for 650whp.
1600cc injectors and the Dual Denso Fuel Pumps will be good for about 825whp, where the fuel pumps will then be your limiting factory. Injectors are good for over 1000whp.
After having three different sets of Walbro's fail on me and one set cost me a motor under hi-boost, I'd run for the hills...