If you are running a 2wd waterpump & thermostat housing then one of the heater matrix hoses goes to the waterpump itself, on a 4x4 setup then yes to the thermostat housing.

Are you still using the standard modine between the oil filter and block? If yes then the other heater matrix hose goes to one of the water outlets on that and there is another hose that goes from the other water outlet on the modine to the outlet on the back of the head under the inlet manifold. If you don't have the modine fitted then the other heater matrix hose can go straight to the outlet on the rear of the head.