easiest way i would do injection on an a12 would be to buy a single sidedraught weber manifold, an injection perfection throttle body, and choose a computer of your choice, fire it up and drive away. simple quick bolt on and a tune. fun to be had all round, if you don't get the concept of what these guys are saying bout plennum sizes and stuff, then y try yourself, sorry to b blunt but thats the game with modifieing cars