68 Barracuda 440 getting hot in traffic

I will say this.......although my truck was not running hot, it was "more" temperature than I wanted it to run when I first got it. I've had it so long now, I honestly cannot remember the numbers, but I suspected the thermostat might be faulty, removed and tested it. I was right. It barely opened in a pot of boiling water. I replaced it with a Mr. Gasket high flow and the temperature dropped almost out of sight. It barely pulls the factory gauge off the "C" now, even on the hottest of summer days. That might be something to "try" if you want "a little more room".