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If the gaskets were on incorrectly it would continue to heat up even more at road speed, regardless of airflow. Olddog made a good point about purging the air, you need to be sure there are no retained air pockets. If there are any threaded plugs in the water passages of the manifold you could fill there until is runs out, cap it and then continue filling at the surge tank. I'm betting on the water pump drive ratio.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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