Tons of information out there regarding today's operating temperatures. I can grab some links for ya.
But one supporting claim for the 10r80 designed to operate at 200+F is the factory service manual procedure for checking fluid level. It calls for checking it at 206-215F.
I'd buy a brand new straight-6 300 with a standard transmission, if Ford offered such a thing. Although I'd prefer current era tires/brakes/suspension, as well as current era interior text tiles, HVAC, and lighting technology. And I'll hope for more than a single speaker in the middle of the dash? 😁