I used that water pump as my dyno setup for a few years. We used 1 inch heater hose rather than AN line. It should be easy to have two 1 inch hose inlets welded onto your radiator tank.

If you have a top down radiator then the hose routing is easy. If you have a cross flow radiator then the hoses have to both go over to one side of the car which isn't quite as clean. But either will work just fine.