Good luck with your project. I expect one injector will be fine. It is all about the amount of time to get things done. Not much time ( rpm > 10,000 ) and you start to need to look at a big and small injector to cover diminished time (big injector to get the shit in there ) and accurate fueling at low rpm (small injector so the dribble does not swamp the fueling accuracy ). An injector dribbles a bit (Injector Latency) before it gets fully open and injecting in a controlled way. Bigger injector = more dribble. But at less than 10,000 rpm you look good for a single sized injector. I am looking forward to seeing how it all goes. Start a project thread or post here. Rob.