Well, it's cracked. How bad is it?

get a hold of Mike, from MRL
he sells locking dipsticks that mount to the cylinder head
that should help keep it in place
Drill a 1/8"th hole where the crack ends, and call it a day.

he means, look up from where the crack goes upwards into the block, and drill a hole at the very end of the crack
this will prevent it from fracking any further