Viking Blue,
One simple fix: get a radiator overflow bottle. Joe and Don are right; every new car built now comes with overflow protection. Back in the day, Olds did have a problem with "overheating" in conditions similar to what you've described. The 455's were especially susceptible. That's why they started putting overflow reservoirs into the cars made with BBs. I think it's just a smart thing to do under any circumstances, especially if you are driving in heat, or stuck in traffic. Your engine IS going to run hot because of the lack of air flow, or the really hot ambient temp mixing with the already hot underhood condtions.
Read your owners manual (The one I have is for 1972) but I think they're all about the same. For your cooling system (Page 59)
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Check the coolant level at oil change intervals UNLESS THERE IS EVIDENCE OF LEAKING OR OVERHEATING. Do not remove radiator cap when solution is hot and under pressure. COOLANT LEVEL SHOULD BE 3 INCHES BELOW THE LEVEL OF THE FILLER NECK WHEN THE ENGINE IS COLD.
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(That should be easy enough for anyone to check)
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* Add 50/50 glycol/water as necessary DO NOT OVERFILL.
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So there you have it, right from GM. BTW, NEVER add pure glycol; it can contribute to even hotter engine temp, and in really cold weather it can "gel". In an emergency you're far better to just add water.
One more thing, depending on the water quality in your area, you might want to mix your glycol with pure store bought water to avoid crudding up the heater cores, thermostat and rad cooling fins. Good luck.