Factory cast iron 413,426,440 Dual quad intake with Carter competition 5eries 500 CFM carbs

It is a marine intake, water circulates thru the intake for cooling. The pipe is attached to a standard removable fitting. The threaded pipe holes in the
Top of the intake were part of the system.
If you wanted to be really creative, you could arrange a tank to pump ice cold water throughout the intake, thus increasing the denser charge of fuel and air.
Or you could pipe plug the holes and drive on.