Big Block Tunnel Ram 660s Questions

I have wondered much of the same. Mine worked much better with the small air cleaners. I have wondered if I have lazy air and reduced signal on the carbs. Not enough motor?? I have velocity stacks only at the moment and wonder if I need the motor to pull harder on the boosters. I picked up 2 of the 4 hole spacers for under the carbs which should help signal. I also added 0.010" wire in the main air bleeds to make them come in sooner, but can't drive the car....winter in WI. When I slowly advance the throttle 2700-3000 the fuel is lazy thru the booster and that is the stumble. I can watch it happen