Sorry, slow to respond on this! I can't tell if it's an actual crack or if the block is just slightly porous or something, but it's leaking where the blue has been colored in - below that reinforcement rib. He cleaned it off, then drew on it with a sharpie to indicate where it's leaking.

He is going to try JB Weld and then some alumaseal. If that doesn't work I'll help him pull the motor and get it to a machine shop to be welded.