FWIW, many owners solve the 90 degree bend problem on their radiator in & out spigots with a pair of big sweat-solder copper fittings (that never rust) and two short straight sections of 1-3/8" or 1-1/2" rubber hose per bend. Using them also extends the crossover hose away from the core for sucker fan & shroud clearance.
The main advantage of aluminum rads (besides 1/2 the wt) is the 3-4X larger core tubes that hold more coolant and flow so much more- not possible with copper rads. The Pantera needs all the cooling help it can get since its stock engine produces as much power as a 350 'Vette but the stock rad is 20% smaller and 6 ft away from the heat source. Then we modify them for more power & torque....