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My '70 has a stock clutch fan as well as an electric fan. The electric fan is never needed, up is a good backup if the need arises.
My 72 has a completely stock and mostly original setup with ALL the radiator foam and sealers in place. I have been stuck in stop and go traffic with no overheating trouble. The car is fully loaded all options and A/C. The car is all bone stock. I run 60 % anti-freeze / 180 stat.
In my 85 with a fully worked 383 +a/c I use ICE (both Jegs and Summit carry it) in the anti-freeze it cured a potential heat problem by almost 15 degrees. The cooling system is stock with a 160 high flow stat.