While I don't live in Texas, I've been stuck in Boston traffic during 95*+ days. Never overheated, or even came close despite idling going 5MPH for an hour. with a 180* T-stat, my mechanical gauge never read about 176*. My biggest problem now is the car doesn't heat up enough during the winter for the heater to work or for the carb choke to stay warm enough to keep it off.
All I upgraded was to a 3-row, stock form radiator. Stock fan, pump, and a 180* T-stat.
I won't debate the merits of Aluminum/Electric Fan versus stock. That is something everyone needs to decide for themselves.
However, before you go spend the big dough on that kind of set up, make sure you cooling system is in good working order. If you can verify the condition of parts, it might be a good idea to replace them. Waterpump, T-Stat, hoses, etc. Flush the cooling system. You can upgrade the radiator, but it may only be masking the underlying problem (or, like in my case the old radiator was the problem due to massive internal corrosion).