I bought a vortec crate engine complete with accessory drive and water pump. Instructions say to run a bypass hose from the water pump to intake. There is only one place to attach a hose on the water pump. If I do that where do I connect my heater hose?

I know there are water pumps with two openings in the top for hoses. But this is the pump which Chevrolet supplies with the engine and I would like to use it and not have to buy another. Any suggestions?