Keeping my 273 commando cooler during these record hot temperatures

Mean416 said
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.

Thank you for the input! My comment "Mopars tend to run hot" is based only on my lifelong ownership and experiences with them...starting with the '66 Plymouth Fury I my dad passed along to me as my first car :). My thermo is good, and appreciate the caution on the high-perf water pump. Maybe there's a reason I haven't yet put it on! Will double check my timing. Head gaskets fine as it's been professionally rebuilt. Again, thanks for your comments!