Keeping my 273 commando cooler during these record hot temperatures

Mopars don't tend to run hot. That's simply not true.

Make sure you're running a proper high flow thermostat. Very common mistake with AutoZone crap.

Beware the high performance pumps etc. they don't always do what you might think. Your car didn't have overheating problems from the factory even in the heat.

Make sure you're running enough advance. Us vacuum advance hooked up? Retarded timing will cause overheating.

Blown head gaskets will cause overheating bug time.

Get the basics sorted out first.