1973 Dart Swinger cooling

Have a 1973 Dart Swinger stock 318 2v Auto. 63,000 original miles. Radiator was recored ( looks small 19” but it’s orginal ) runs fine on the highway in traffic on a hot day gauge goes up to half way(not sure of actual temperature).Has not boiled or anything. Like for it to run a little cooler in traffic. Would a fan clutch help or a cooling fan ? Any info would be helpful thanks.

32064CED-1842-45E9-A510-EC64236CFE0B.jpeg

5F358E73-7EE2-4972-9532-577C2A198181.jpeg

F8C89B96-3C7B-4A40-A040-5D8DAC6036DF.jpeg