RC Engineering has an easy BSFC CALCULATOR to help determine injector flow required to support a desired CHP. The stock injector flow is good enough for ~ 540chp w an 80% headroom from static.
I would also recommend not taking flow rates for granted from the supplier and get the Injector Voltage Offset(if available)for better idle performance. You?d be surprised at how much smoother the motor runs when cylinder fuel flow is evenly matched.
https://www.rcfuelinjection.com/Technical