Well, the more I thought about it, the more I decided that I should tear down the whole engine to take a look at the main bearings, too. I'm glad I did, although it turns out it probably wasn't necessary. The main bearings actually look pretty good. There is some slight scoring in the #3 bearing (kind of hard to see in this picture, and the case is upside-down, so it's the second one from the left), so I'll replace the whole set (now that I have it apart).
Total Time: 5.5 hrs.