One of my students learned that the hard way on a Ford 351W. He opened up the front of a head gasket to match the shape of the water port in the heads- - - -instant overheat! The back end of the gaskets had a big hole, which produced the right flow to the back of the block, then forward in the head.
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!