Thoughts on Cooling a Stock 383 HP Barracuda/Dart.

Original 383 Barracuda/Dart owners, anyone have an issue with getting your car to run 180 with a 180 thermostat. Mine runs about 190 or so down the highway, 210 sitting in the heat of Summer. My stock 22 inch radiator with shroud has a new core. I've checked all the other possibilities in the cooling system itself.