Use a 5/8" wrench size tapered seat plug to fill the holes. BUT- - - -also put a gasket ring under the taper to prevent getting paint on the area that has to transfer heat. Break the porcelain shank off the plugs if you wish- - - -less interference with the paint spray that way.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!