On a 2000 Mercruiser 5.0L carbed?
I offered to show a friend how to winterize and want to be sure I have all the drain locations.
There are two on each side from what I understand.....One on each manifold and one on each side of the block.
I will also look for the PS cooler as well.

Any other drains?

Look under the waterpump in front. There should be a total of 5

Thanks Waterwing