Overheating 360 new engine

Lol. Ok buddy, if you say so.

Sounds to me like your definition of "street car" is a lot more like "weekend warrior" than actual street car.

What octane is that "pump gas", and can you get it from the gas station on the corner? Is that 11:1 with iron heads? What's the dynamic compression or cranking PSI?

How many miles a week do you put on your street cars? At what elevation? At what air temperatures?

I think your advice is entirely too specific to your build. Because the reality is that won't work for every build, and saying it will is bad advice.
The cranking PSI on my slant 6 is over 175 PSI and I run on pump premium with zero spark knock. It runs on 87 with no spark knock, but it runs a lot better on premium. His advice worked very well for me.