How much is too much dual quad

Ya it's all about the "coolness factor" Good thing the 6 pack set ups had vacuum outside carbs. They really couldn't use or didn't need all that cfm.
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.