First, ALL Pantera in-dash gauges read WRONG! They all need a resistor in the gauge line to calibrate them even close to correct, and even Ford specified two different values of resistor. Second, running a big radiator and stock fans will not change the laws of thermodynamics- the pathetic stock fans must be changed as well for stop-and-go driving, and you didn't mention this. Finally, properly bleeding a Pantera cooling system is difficult- are you sure all the air is out? I once did some rad work on my car and after two bleeds and 550 miles of driving to 'Vegas at speeds up to 140 mph, I got some air out on arrival.....
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