This is what the reluctor looked like before I cleaned it up. Sorry, didn't take an after pic.
After installing the pick up coil, I reinstalled the distributor with the engine at TDC on cylinder 1 (compression stroke). But when I went to start it so I could set the initial timing, it turned very slow and then stopped like the battery was dead. I tried jumping the battery, but still only got "click" when I turned the key. It had been seeming to turn slower and slower as I worked on things, so I suspected a bad starter. I needed to run to the parts store anyway, so I crawled under to pull it out. And I found this:
Yup. Starter's leaking. No wonder it's not working. Better get that sealed up!
In all seriousness. I didn't like what I was seeing. Nothing up top was leaking water. So I either had a bad freeze plug or a cracked motor. I admit. It sat with water in the block for a winter. So both were possible.
After pulling the starter, however, I found it was just a rusty freeze plug.
Minor oil leak.
So I ran up to the parts store and had them test the starter while I picked up a new freeze plug and some other parts. I guess I should say I think I had them test it. They seemed to have trouble figuring out where all of the wires connected on their fancy pants testing computer. Ultimately, they decided it was bad. But they didn't have any in stock. I wanted to tear it apart before spending $100 on a "cheap" rebuilt one, so I just brought it back home.
Once home, I tore into the starter. The solenoid looked ok. There was some oil inside the casing, so the seals are starting to fail. I cleaned it out and moved on to the motor portion, where it was immediately and unmistakingly obvious the problem actually was. I give you my starter:
Yikes. You can actually see part of the problem in the picture of the starter on the truck where it's dripping water. There's a round hole in the casing that has become plugged with oil and gunk. I'm pretty sure this is a vent hole that doubles as a water drain. Since it was plugged, all that water that was making it past it's worn out seals had nowhere to go.
At this point, I just wanted to know if the pickup coil fixed my stalling problem, so I decided to clean everything up and see if it would work for a little bit, at least. Two cans of brake parts cleaner later and it wasn't looking terrible. The brushes are pretty worn out and unevenly from each other, but will work for now. I plan to replace the whole thing eventually.
I put it back together and reinstalled it (without replacing the freeze plug, of course). To my surprise it worked! The engine turned faster than it ever has with this starter and sprung to life. I adjusted the timing and tried to go on a test drive. But no, the pickup coil didn't fix the stalling issue. Back to square one.