i have gt 40 crate engine , x303 heads , e303 cam , shoty header , and i just aded a powerdyne 9psi supper charger , what throttle body should i use , what mass air , and what injectors would do the best?
With a properly calibrated mass air meter you really can't go wrong with the larger injector. The duty cycle will be short initially but when you start cranking up the power you may find that you'll be glad to have had the larger injectors. I'm assuming that you have the 302 or 306 longblock and not the 450HP 347 offering from FMS. With the stroker, the 42lbers should be right at home.
70mm-75mm TB
80mm MAS
42lb Injectors
No FMU needed and that is the reason for the 42lb injectors. It is just as cheap or sometimes cheaper to get the 42lb instead of the 36lb injectors.