How much is too much dual quad

Get it out of your head that carbs are forced induction. His engine will only pull what it needs. He will tune the accelerator pumps initial shot by the squirter nozzles, pump arm adjustment, and the size of pump (30cc or 50cc). After that, the engine only pulls what is needed for air and he will tune the jetting to match.
Oh I understand and I am a lot smarter than you think I am. The op has a Fast fuel injection set up on it now. It almost sounds like he is a young gun looking for a wow factor tunnel ram sticking out of the hood. If he was experienced and knowledgeable he wouldn't have asked "how big is too big" in the first place. Think about that before you talk him into it.