Funny how this goes-
I spent about a day and a half on and off working on the driver's side brakes with one hiccup after another. Among other things, I mentioned the C-clip above that holds the wheel cylinder in place. Instead of using the supplied new one, I reused the old one, and got it in place with a pair of channel locks. The springs were fortunately straight forward. I watched a few videos on Youtube, and most showed fitting the bottom spring with the shoes off the car, stretching them to engage the wheel cylinders, then fitting the top spring and stretching to engage the adjusters. It honestly wasn't too bad, and unlike before they're on the car correctly now. The biggest bugger, aside from the anti-rattle springs, was the handbrake spring.
Also, just for the sake of getting the lines to some semblance of clean, while I was still over on the driver's side(which is furthest from the MC), I used the Mightyvac until the line ran dry. Most of the fluid that came out was pretty nasty, so I don't think it was a terrible thing to do on the whole. I left it empty until I could get the other side emptied also.
The passenger side got interesting. Everything went together easily, and by the time I'd opened the line to fit the cylinder, it was completely empty. I refilled the MC, bled the driver's side, and then went back over to the passenger side. The only thing was I couldn't get fluid out of it. With the bleeder open, I could pull 20" Hg Vacuum on the nipple and would just sit there and hold vacuum. I finally pulled the bleeder completely and had fluid drip out of the hole where it was, so the line was clear. Just the bleeder hooked up to the Mightyvac, though, would also hold a strong vacuum. I could poke at the hole in the side with a wire and get a little bit of air through it, so something was blocking it.
I thought about robbing one from one of the old cylinders, but they were both nasty and I didn't feel good about putting that in my clean new cylinder. Finally, I just said down with a set of drill bits(turned by hand) and manage to get out whatever was plugging it up. I still don't know what it was, but at least I got it fixed and have a nice firm pedal.
I'm going to need to order drums also. I finally got a shop to agree to turn them, except that they measured out at 10.05" and the max is 10.06. So, the job still isn't "done".