[Region Warrior]

Ok, simmer down
Didn't mean to get ugly. This topic comes up every year since the 70's(for me).
Grew up in new 60's/70's Pontiacs and 1st car was a 68 FB from 75-82, and have a 67 since 79.
All my buddies had muscle cars. They all ran over 200*.

Been to Arizona(brother inlaw lives in Phoenix). And Death Valley in 65. Never forget it.
7 of us in a month old 65 Bonny full of luggage and A/C full blast. 115* out at the time, dad was concerned cause temp gauge was pegged most of the trip.
Us kids where complaining how cold it was in the car. After 5-10 minutes of it, he pulled over and made us get out for 10 minutes(felt lot longer lol) while he and mom in the idling car stay'n cool.

Wouldn't necesarly call 11.70-12.00 @ 114 mph with 3.42's on 87 octane in 95* heat detuned. And also drove it 70 mph plus for 20 miles in 95* heat more then once.
Most guys think its overheating when radiator over flows.
Cause is usually aftermarket stuff and/or missing factory stuff.
Or radiator full to cap when cold which is incorrect. should be 1.5"-2" below.
Don't take this wrong. But since you dont believe they ran that hot back in the day, check 60/70's factory service manuals and road test articles from the 60's and 70's.