LS7 injectors & throttle body

[Cdog]

I've got a guy who want's my factory intake, fuel rail and injectors. I'm going with the fast intake to replace and the mast fuel rails. What HP/tq are the factory injectors good up to? Is it worth it to replace them or keep the factory injectors?

Is anyone opening up the drive by wire throttle body's to flow more to match the fast intake?

Who do you recomend?

Thanks in advance!