Well back to this project. I went ahead and changed out the pump and while everything was out I had the radiator addressed. It's an original 053 rad for a big block Dart. Ended up getting a 3 core high capacity core while keeping the original tanks.

I also decided to upgrade the stock WP pulley. Picked up this smaller pulley which will increased the speed of the water pump. Figured if it didn't work I could always go back to the stock pulley.