I guess the injectors are inside the throttle body. In my mind, I was picturing injectors similar to multi-port EFI plugged into the sides of the throttle body with fuel rails.
That seriously made me laugh! LOL I have a few Arduino's around here actually. I have an Uno board an a few micro boards that plug directly in a breadboard. I used them for Halloween prop control. Worked decently well, but that was due to my creative sketches. ;) Maybe with some creativity, chewing gum, and luck I can build an EFI too! Not likely! LOL I'm totally kidding by the way! :)