A-body 493 stroker had a real bad overheating problem. Changed from a 22" to 26" aflo performance series radiator, perma cool electric fan 2950 cfm. I'm running a meziere electric waterpump. I went with the zerex o5 mixed 50/50 and waterweter. This is on the street now... 185-190 running down the road. stoplight's 200-210+. It seems to recover once I begin to move back to 185-190. I feel this is still to hot? Gottta be enough radiator? Go back to a stock water pump? 180 thermostat from napa.