Why run dual quads?

The only thing that comes to mind is better fuel distribution at wide open throttle, and of course the engine underneath must be able to handle all that fuel. I ran 2 Edelbrock 1406's on a 472 Hemi, richened up the jets in the rear carb and it ran super. But looking for the ultimate tried Fi Tech with 2 throttle barrels and now have Edelbrock pro flow4 and haven't completely dialed it in yet and runs pretty good.