you still need a throttle body (or bodies, depending on your path) Bt really, buy a kit. You will save a ton of money and headache over cobbling pieces together from other FI units. Even when you get the thing together you will still have to have an ECU burned for your specific appplication- especially if its one off. If you really want to try to build FI from scratch make a mechanical injection, or a direct injection system. I suspect you will have better luck, although its still wont be easy. My suggestion would be to start with some tall air horns build butterflies, and a linkage system, get your injectors, and viola! of course it wont be that easy....