1960 Valiant Restore: advice welcomed.

Interesting. The radiator was recently restored, and the coolant was replaced. Can the Slant 6 get plugged up internally? The travel of the temp gauge was slow and steady.
So, I gently nursed her 25 miles back to the shop. Within 15 minutes the temp gauge pegged, but soon after slowly dropped to the intermediate, operable, range. When getting off the highway, the gauge started to peg again, but then reversed course and slowly eased back to the intermediate range.

Mr. Burek took out an infared gun and the temp at the radiator intake was 192F and the block inlet 172F, which corresponded to the gauge reading a bit over dead center, but still in the operating range. His opinion that nothing was wrong. I remain unconvinced. Any ideas?

Another bit of news, the parts for the original radio came in and it runs on 12 volt tubes! I find that wonderful.

And I gotta say, driving this lovely old girl is like riding a magic carpet made of marshmallows, and no, I'm not smoking any jimson weed. Usually, I hate driving, and would be happier on a bus or a train, but this is a totally happier experience.