Edelbrock setup for dual quad

TT5.9mag said
When you double the available throttle bore area you effectively cut in half the signal to all of the fuel supply. You went leaner initially with rods and jets and you should have gone richer. Common misconception that a bigger carb (or multiple carbs) will drown an engine. It’s exactly the opposite. Make changes based on observations not on assumptions. Read your plugs.

Thanks for this, I am just about to install a dual quad, 1:1 setup on my 408, and did exactly that. I jetted carbs down thinking there would be more fuel. I will set them back to standard setting for initial trial.