Ford 201 diesel 3 cyl with 9/16" head bolt casting #'s

Anyone out there have a 201 diesel with the 9/16" head bolts and can share the casting number? My head is cracked, and I need a new one. If not, anyone have luck opening the holes in a 1/2" head without hitting a water jacket?

Ford 201 diesel 3 cyl with 9/16" head bolt casting #'s