[geezer#99]

Here’s the kicker!
Your pump may have the hole.
The hole and passage may be there in the block.
But there likely isn’t any hole and passage in the head.
If there is no hole you can pull the head off and drill it out.
To see if the passage is open from the pump to the coolant passage in the head (use a wire snaked thru) you might need to remove the intake.