If Jim says Titebond will work on an old crack's surface, follow his advice not mine. And if you can open up the crack enough to get the glue in then there is no need for holes.
As for the extra gaps on the mouth I'd just ignore them. Chips from the edge of the casting are quite common but not a problem.
As for the extra gaps on the mouth I'd just ignore them. Chips from the edge of the casting are quite common but not a problem.