Edelbrock Pro Flo 4 EFI

Down and dirty injector size formula: lbs/hr=HP/(cyl*2) target HP divided by double your cylinder count. 300HP V8 {300/(8*2)} is 300/16 or 18.75 lbs @ standard 39.15psi fuel pressure. You can tweak your fuel pressure to go up in psi easier than changing injectors!