Great suggestion, Peter. I'm gonna just get a .15 cent nylon tie and tighten the pieces of that crumbling plug together. Its so bad right now that you could flick it off the metal bracket with your pinkie finger.
I believe those wires are used to figuring out which cylinder is "predetonating" (knocking). Regardless, I don't think the other wires you described should be where they're currently at. Doesn't sound like your previous wrench was 100% familiar with these cars.
Pretty car on your site, by the way.