Any bolt will do!

Look at the discolored spot in the picture of the cylinder bore... the cylinder wall is bulged out there.

One of the holes in the left front of the block is open into the water jacket and points right at the #1 cylinder wall. Too long of a water pump/timing cover bolt in that hole does not get stopped by anything until it jams into the #1 cylinder wall from the water jacket side of that cylinder wall. It busts the cylinder wall there....