With the right tuning a stock CP3 will handle the injectors, but you could only go so big on PW before you start draining the rail. Question is what turbo are you going to be running and how much power are you planning to make?
I had a 68mm Cheetah and was out of fuel to give it (raising PW dropped Rail Pressure). I had a stock LBZ CP3 with 90hp Dynomite injectors. I also suspect that my race valve wasn't seating all the way but didn't do a bottle test to confirm it.