That 452 head can't be fixed with a drill press. The head would need to go in a vertical mill to have the broken part milled off. There isn't any cheap way to fix it since welding cast iron is a pain and building custom rocker stands is a pain. The head is junk. The OP is free to call around to all the machine shops in his local area and they'll all tell him the head is worthless junk. He can call every machine shop in his home state or however far he wants to travel and they'll all tell him the head is junk.