Spent some time over the last couple days on lingering details. Repaired an exhaust hanger, replaced the gauge regulator with a Ford NOS part, and finally have the wipers parking semi-reliably. The NOS gauge regulator (in place of a no-name solid-state that didn't get the job done) now has all the gauges working and showing fairly sane data. The fuel gauge actually reads nearly full after adding 9 gallons to the main tank yesterday. And the wipers park properly every time I turn them off. Finally. I have no idea how many hours I have spent on the wiper parking issue, but I know that I can disassemble and reassemble the wiper motor in a matter of minutes now.