you are wasting your time or going to need to spend lots of time of money to get that stuff to work at your power level...not going to work with 600+NA HP, ask around..

Why won't it work with the proper sized injectors and pump? Just telling me to ask others and I would be wasting my time doesn't really help me at all....

You can mix and match pieces and it will work but you might want to consider one of the self tune ECM's, they are a lot more user friendly.

I am liking the FAST EZ EFI and thinking of using that with a factory manifold/rail set-up with bigger injectors and pump.

I know nothing about the factory manifold, you may want to see what it's HP limits are. The aftermarket manifolds and rails aren't that expensive.

I like the full EZ EFI 2.0 FAST kit, but I don't like the 4 barrel style TB for boost.

You can use a Fast, Holley, Edelbrock , Accel, whatever manifold with injectors and rails, the Fast 1375 throttle body and the fast XFI 2.0 with self tune.

Just go roots and dual carbs. Easy and reliable or call whipple and get the whole kit.

I am not doing a roots. I am doing a custom turbo set-up and need a throttle body like OEM.

the factory manifold is not going to handle the airflow to make the power you are going after..not even close, a few have spend tons of hours / $$ on making them work ok, think of it like this just put a std performer oval port intake on your engine and then try to make 600+hp...you can ck with artifriends on here he will enlighten you on those intakes..but if you insist go on with your bad self...