Fuel Blowing Out Carb Vent Tubes Under Heavy Throttle: Expert Opinions Please

Sounds like fuel level is to high. We use to use a piece of 5/16" hose run from one vent to the other with a slice taken out of the topfor air. Or there is this.
Holley Carburetor BOWL VENT TUBE TRUCK AVENGER OFF ROAD RACE DEMO DERBY A23 | eBay
I am aware of the hose mod, I'll look into that and maybe lowering the floats a little. I'm just baffled why the issue cropped up on the other carb, and is doing it with the new. Gonna drain tank flush fuel from lines, get some fresh fuel, and see what happens.