Anyone who knows feel free to explain to me why a Marvel-Schebler updraft can feed 300 hp with gravity but pumps are needed for Webers or Holleys.  I understand the updraft gets another 18” of pressure but am assuming it is simply by design that the response is improved with a few lbs of pressure.  Since we aren’t too worried about throttle response as long as it doesn’t stumble, would a gravity-fed Holley be a waste of time?

Todd