On the subject of radiators and cooling for a daily driver 420HP Pantera... I have done the swirl tank mods as shown in this thread ( VENTING SYSTEM ), below is my old post after I unwrapped my new radiator,single 16" spal sucker, I have the flow kooler anti cavitation pump, no heater, and SS tubes. I can report my car runs about 175 and even on the hottest day in central Florida, with my A/C blowing ice cold, it still runs under 188, I seldom if ever see temps above 185. In short, these mods will resolve all cooling issues.
Photo of my radiator