Originally Posted by motoron

Look thru the top of the carb (engine off of course) with the choke fully open (if applicable) see if the secondary butterfly's are opening. They either open by vacuum or are controlled mechanically either way disconnect the linkage that makes them open.
Its rare that a car would FLOOD out when secondary's open. By driving the car on two barrels that should eliminate any questions of electrical problems. More likely not enough fuel like a giant vacuum leak when secondary's open. Easy to try but remember
no rotors came equipped with a holly 4bbl stock so it could go either way.