Heres one link I found when I was searching for fuel rail sizes versus horsepower requirements.
They do it via HP, I did by fuel requirements. Well they did both but they give line sizes based on HP, not flow rate.
fuel rail stuff


Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black