Charging system looks to be running fine. I replaced the battery last weekend and it's driven fine since then with no problems at all. I figured the battery was toast when I took it out, charged it on the work table, and it was half drained when I checked on it the next morning.
It's not the muffler that's bad, but it smells like there's an exhaust leak just behind the manifold, and the pipe's got some gnarly welds in it which I think might be where the leak is coming from. So I figured since I'm going to be down there with everything apart to replace the pilot bearing, I might as well clean up the exhaust too, from the manifold back. I'll be giving it a small body lift and, once it's lifted, cleaning off the frame and coating it with rust preventative.