Is this block usable?

My brother bought a 350 with a portion of the starer mounting hole snapped off at the bottom of the block in a similar fashion.
We had the block machined and they brazed, drilled and tapped it for peanuts ( 50 bucks if memory serves correct )
I too thought if it's a leaking point that's a real fly in the ointment.
You could have some good money tied up in a headache.