I have a 68 RS w/a 327. It is pretty much stock except for the exhaust and a mild cam. I have been having temp. problems for the longest time now. I changed the thermostat (180) a while back. Changed the cap. Hoses seem fine. Then had the radiator redone. I thought I would be off and running but the temp still rises quickly while at an idle. The temp goes down about 5-10 degrees once I start going again and I always ride with the heater on. WTF? Any suggestions?