Tunnel ram or no tunnel ram...

It’s my understanding, and I’m by no means anything close to an expert. When you are running multiple carbs, they aren’t individual carbs, they have to act as 1 carb. And there’s also a reduction in cfm, it’s not a full 1500cfm (there’s some science I don’t understand there.) That’s why the idle circuit has to be reduced by half, and I believe there’s other circuitry that has to be reduced too.