It's interesting that John Taphorn's remote thermostat cooling mod. is more widely accepted in the GT40 replica world than it is in the Pantera world. Perhaps that's because GT40 replica builder's are starting with a clean slate, rather than modifying a production car.
John's logic is sound. In an automotive cooling system, coolant flow is the most important factor. The greater the coolant flow, the more efficiently the cooling system functions. In a Pantera, the effect is, less chances of hot spots in the cylinder heads and greater ability to dissipate heat. A Pantera with this mod. is more likely to have a steady coolant temp., as opposed to a coolant temp. that rises and falls. Unfortunately, in a Pantera you can't simply increase water pump speed to increase coolant flow, due to cavitation.