Things I have learned about performance engines and cooling systems are you need a lot of coolant flow and good clean airflow over the largest rad you can fit in the core support. I drive a Flowkooler pump 1-1 with the crank and an ECP 26" aluminum radiator with great results. https://speedcooling.com/product-category/radiators/mopar-radiators/page/2/
Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60