In this heat I'm running 195 stats. The engine needs the temp it gets to 205 when stopped at idle for 15 min, key here is how high does it go if it only hits 220,then comes down. No older performance engine ever stayed real cool on a hot day at idle but they did not overheat. Pay attention to amount of antifreze you run, concerned about running too hot run a gallon of antifreze and rest water until the winter