Keep in mind you want to stay around 80% duty cycle max as well. I know 670hp (at the flywheel) on 40lbs fuel pressure pushes those injectors right up to 80% much more than that! and you have a couple choices to make.
If you're set up with a manual regulator, then you can bump up the fuel pressure to make the injectors "act bigger"
Going larger on injectors
Or you could always push your luck with running high duty cycle, just remember that when you go above 80% you're going to keep them firing longer! and off a shorter period of time, so injector life will suffer ultimately.
This is all assuming you're running e10 pump gas, and are boosted with a bsfc of around .55.
Also keep in mind that different race fuels will have different stoichiometric ratios. (IE e85 requires much more fuel to make the same power) . So to run the amount of fuel you need to for certain fuels may not be feasible for those injectors. You'll have to do your research on the race fuels.
