I'm back!
Okay, I never really left. I just haven't been working on the boat. Today I did, and I can give a good report. Solved, but not fixed. That's the current status. I know what's wrong, but I can't fix it until the parts come in.
After doing the Link-and-sync above, the butterflies were finally opening all the way, and I picked up a few more RPM, but it was still deadly-slow out of the hole, and I could tell it had a persistent misfire. It just ran rough. This evening I ran to town to get the right kind of spark checker (please tell everyone not to waste their money on the flashing-light-in-a-tube style spark checker). I set it to a half and inch and went outside to watch for sparks in the twilight.
Turns out, I didn't need the new spark tester, I just needed the twilight. Once I fired up the motor in the near dark, It was clear that the number one coil was bad. As soon as the coil got warm, it started arcing and sparking from the body of the coil to the block. The spark was obvious in the twilight. Even while dodging mosquitoes. Once it started arcing there, it stopped arcing across the spark tester. Which means, I suppose, that it also stops firing the cylinder when it's sparking to the block.
New coil on order. Can't wait to get it installed!
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(I'm celebrating by adding a slice of tomato to my bologna sandwich. It's the little things, right?)