The block is machined for the high-mount water pump. A 216/early 235 water pump would be needed to complete the buildup. Later engines had one big hole for the pump impeller to fit into, just above the timing gear cover.
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!