Fuel dumping from booster venturi

Troy with his hemi dart had similar problem with repro holley hemi carbs when cruising around in the car.

He had to run an adjustable fuel pressure regulator. Forgot what he had to set it at.

Usually with AFB/AVS style carbs, fuel dumping like that is a float issue. I would get it at idle though.

I'm sort of surprised you're running edelbrock carbs with a 900 hp race hemi. I wonder if they have the adjustability for street driving a 900 hp setup like yours. Stuff like adjustable: air bleeds, secondary throttle plate position, 4 corner idle circuits, etc, etc.