I have a 73 Dodge Dart and I rebuilt the motor and since then I am having an problem with the enigne overheating after about 20 min of driving. It also seems like it is lacking power. It has the stock exhaust manifolds and a edelbrock 4bl intake with edelbrock 4bl carb 600cfm. It is an automatic with a brand new tranny. New radiator with a 195 thermostat. It is an AC car but I don't turn the AC on in fear of it heating up quicker. I put a new distributor with a new vacuum advance to see if it was a timing problem. Please let me know what this could be. It hits around 230 degrees in about 20 min of driving. It just doesn't seem to be RIGHT! PLEASE HELP!!!!