Rear engine Pantera owners struggle with cooling.  We recommend the FlowKooler hi flow water pump 1648, a Robertshaw 333 series thermostat and this copper radiator in lieu of the common aluminum one.   It was developed in collaboration with Pantera specialists and is designed to fit with no modifications to the vehcicle.  

You may purchase the radiator or the radiator, 2 SPAL fans, two tank-installed temperature sensors, wiring harness, two relays, draincock and airbleeds.