I got all of return caps and lines installed, double-checked everything to make sure I hadn't overlooked anything obvious, hooked up the battery and gave it a crank. Surprisingly, it didn't take that much cranking (maybe 10 seconds) and it fired up. After a few seconds of rough idling it smoothed out. I was pleasantly surprised, there was an improvement in the sound at idle... smoother, I guess? I let it warm up for a few minutes and observed a noticeable improvement in voltage output: there's a full volt more than the best reading I observed with the 1G alternator! I am very pleased with this result! (Also, I waited for a few hours after my test drive and checked the resting voltage of the batteries: 12.65 volts. My experience says your batteries really need that extra volt in order to stay fully charged.) My takeaway: if you're having a low voltage output with the OEM alternator, upgrade to a 3G. It's a noticeable improvement.
Also, the fuel injector replacement was a great upgrade as well. I had a noticeable improvement in throttle response and power. There's a hill about a mile north of my house that's roughly half a mile long. Before the replacement, if I was traveling 60 MPH when I began to climb it, by the time I got to the top (with the pedal to the floor) my speed had dropped to 55 MPH (with the truck unloaded). Now, traveling at 60 at the bottom of the hill, I was able to accelerate to 65 MPH by the top of it. I certainly won't be winning any races, but the condition of the truck is moving in the right direction. There's still a fair amount of work to do, but I am very happy with both the 3G alternator upgrade and the fuel injector replacement. I still need to get it timed, so I have one of the DTI timing sets from eBay on the way. It's supposed to be here between Wednesday and Saturday of next week (hopefully Wednesday). Once I get that accomplished I am confident she'll be running great... and maybe then I'll turn up the fuel.