More info will be needed about your current combo and ultimate goals to properly answer.
For instance, if you're running stock bottom end, stock heads, cam, turbo, etc. and your goals are to keep the car fairly stock - the 255 lph pump is plenty to support 60# injectors.
However, if you're bored, stroked, running aluminum heads, gigantic turbo, E85, and are aiming for low 10's - you'll likely need more.
Give us some more info on your current combo and ET / trap speed / HP goals for the car!!