Well, things didn't go as expected. I sorta sabotaged the whole deal, and the lone holdout didn't show.
I did the oil change on it, and during that operation I dropped the drain plug. I grabbed the frame to pull myself further under the car, and the only thing that moved was the frame. A big chunk of it came off in my hand, while I remained motionless. The damage is more extensive than I thought, and though it's still very salvageable, it's much worse than what I'd said in the ad. Now, it's really up to the buyer to look over a 47-year-old car closely, but a couple of these guys--there ended up being four--were coming a long way to buy it, and I wasn't raised to be quite
that ruthless. One guy had a 700+ mile round trip, in fact. So, I basically told them all, "It's worse than I thought, but I'm not willing to adjust the price downward because of that." 700 Mile Guy didn't care, said he was coming nonetheless and taking it home. The rest apparently lost interest.
I waited all day for 700 Mile Guy, but I'd not heard from him since Thursday. I'd already discussed with a few people that if it wasn't gone Saturday, I would just hang onto it. It's not gone, and I'm almost positive it's late Sunday.
Anyhow, while waiting for that lone holdout, I lashed the valves and replaced the valve covers. It's exceptionally quiet for a solid-lifter engine, which leads me to believe every prior pre-'80 Slant Six I've ever seen desperately needed the lash set.

I popped the cluster out for a peek to see if I could determine the problem with the gauges, but a few tests lead me to believe there's a voltage limiter problem, a bulkhead problem, and/or a gauge problem (the needle on the fuel gauge isn't even visible). I verified that the temp sender is good but as nice as it was outside, I wasn't going to attempt to check the fuel sender. The yard was a mix of mud and ice not conducive to such silliness.
Then, of course, the master cylinder failed. So now there's that. It could still be driven, but I'm going to replace it. If the weather allows and everything's still at my favoritest boneyard, I'll do that when I swap the small-bolt K-H discs onto it. :dance: I have no intentions of changing the engine anytime soon, so the 8.75" will not get installed anytime soon. It'll remain on Craigslist, at least for the duration of the ad anyhow. I picked up a set of NOS Mopar 3.55 gears for it just in case, though.

Actually, they were so inexpensive I'd have bought those anyhow, since a 3.55 is a ratio I don't have in my arsenal at the moment.
Buuuuuut... I did order a few small items for it today. A tested, working replacement fuel gauge for $32, a $23 parking brake handle to replace the broken one, the missing front side marker for $24, a solid-state instrument-cluster limiter/regulator for $59 and a $72 Pertronix Ignitor for the distributor--because a new set of points is wasted effort and money since points suck the large one. So yeah, I started spending a little money on it, but $210 covers a bunch of piddly annoyances.
Stretch, who's got a chubby for this car similar if not greater to my own, texted me early this morning in regards to the fact that the Valiant is still in my possession: "OK. Cool then. Next step is stash it and make a plan. I say let's see if Paul has a good rail and if so and if it's a reasonable price we use this as an opportunity to learn how to fix this shit."
My kinda guy. :dance: