Thanks F-One those are good thoughts. I put manifolds on it from a mid 70's pickup. Always thought I should switch them out for headers because it might help the cooling but maybe that is the wrong way to go? I think after reviewing all the input I'll check the vac advance, check timing, check the gauge, see about relocating the AC condenser for better air flow and if that doesn't solve things, get a Zips adapter and go with a mechanical fan and shroud. You guys have pointed me in the right direction that I have an airflow problem since the overheating (if it is really overheating) is occurring at slower speeds. Wasn't a big problem when I lived on the central coast when temps were in the 70's-80's. A little more critical in AZ when it hits triple digits! Thanks again for all input!