Callies RB block

Those extra holes at the bottom are the oil return passages...... for Hemi heads.
On the Hemi, they would go all the way down to the pan area.

They could just be drilled, tapped, then plugged with a set screw if in fact they are drilled all the way through.

Frankly, there’s just no excuse for that block to have made it out of the factory with the missing bolt holes.