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Yep, nice dry joint. That's the way they should be.
I replaced my water pump with the Moyer ball bearing job when I went with glycol cooling/heat exchanger. With raw water, a bit of leakage was no biggie - plenty where that came from. With glycol, it's like leaking blood - you've got a limited amount!
If you're tempted to chip at the rust with a small chisel and hammer (very effective), think eye protection. Full face shield or safety glasses with side shields. You get a chip of that stuff in your eye, and you're going to become acquainted with your local ophthalmic surgeon.
Once you get it cleaned up, you're going to need a good primer. I've been using the Interlux barrier coat stuff - a 2 part epoxy. Rather a pain to mix in small quantities, as the packaging is designed to mix the whole lot at one time. I mix by weight - the MSDS data sheet will give densities so you can get from volume ratio to weight ratio. Once you get it primed, you can use whatever you want for a top coat - even latex.
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