I'm currently working with Wizard Cooling to take their 1970-73 26" B/B MOPAR APPLICATIONS ALUMINUM RADIATOR SKU = 375-100 (with the 1.25" tube upgrade)
https://wizardcooling.com/1970-73-26-b-b-mopar-applications-aluminum-radiator/ and have them mount the Mercedes C class fan with Micro Autonomations Fan Speed Controller
http://www.ma-uav.com/FanControllerv3.html The Mercedes shroud completely covers the 26" rad core, it's PWM controlled and it moves an incredible amount of air. I've been researching the optimal electric fan cooling system for my 'Cuda and to me, this makes the most sense and fits into the space in my engine bay.