Okay, I know the four BIGGER holes are for the throttle plates, folks...but what about the two smaller holes on each side of them (next to the four throttle holes)?? The intake is from a 1960s small block Chevy, likely topped with either a Carter or a 4-jet originally. Should these holes be plugged to run an Edelbrock?? I've never had one of these old cast iron intakes before, so it's new stuff to me!!!