New to site, new to Mopar overheating issues

Yes. The larger non A/C pullies required an 8 bladed pump. I have an aftermarket flexalite 6 bladed 18" diameter fan that's made for a clutch. You can use a stock depth fan clutch for an A body V8 car with your copper/ brass radiator. Should you decide to put a thicker aluminum radiator you will need a shorter fan clutch. The Hayden 1990 jaguar XJ6 fan clutch is shorter and is a direct bolt on. It comes with a centering bushing so it can center on a mopar water pump. It uses SAE thread holes to mount the fan. Hayden also makes a shorty mopar muscle car fan clutch for cars with aluminum radiators that's a little shorter than even the jaguar one and is of a heavier duty design.