I’ll save you some time 🙂
I backed out the hex bolt with the hole in it and removed the inner casing from the outer. That’s the casing you see coming out of the flange on the bottom of the block not a driveshaft. Behind the casing you can see the drain tube that dumps into the outer casing. I used some air on the block to trace the water passage up as far as what looks like the water jacket around the exhaust ports.
Kev