Need help with injector size with friends procharged car

This is concerning my friends procharged 01 cobra. He putting a 18 pound pulley on his car tomorrow. Right now he is running 10 pounds of boost and his 42 lb injectors are maxed out. Hes putting 510 rwhp right. With a A/F of 12 to 1. I know he needs a tune. Hows his a/f ratio gonna be with that small pulley on there. Its a completely built 4 valve car, stage 3 heads, sean hyland blower cams, manley i beam rods, etc, etc

What size injectors does he need. Hes already got a 1200hp aeromotive fuel system and hes running a FAST SpeedPro.

Any advice is appreciated.

Thanks
Josh

A friend of mine is getting a motor built that is estimated to put down 650 - 700 horses. I'm not going to get involved with the details of the car, but they plan to put on 55# injectors. I'm sure that would be sufficient on his set up.

55s on my car with room to spare

thanks yall

Josh

42 lb injectors should cover 500 rwhp EASY. Those are usually rated to around 700hp. He needs a tune bad.