Getting block prepped for the hot tank

No reason to take that one out. The solution gets to both sides of it. Unless you do it every day you are likely to forget it. And it's impossible to put it in after the fact. Too many guys leave out simple gallery plugs. No sense making it harder that it has to be.
Not only that, I think it has to be pretty much exactly the right depth. I wouldn't mess with that one unless the block has a known oiling issue.