the upper hose is out of the block and into the radiator.

on the heater hoses...I don't remember, but I'd bet that it was from water pump to the firewall...where does the other hose go again? whichever hose is closer to the upper radiator hose is probably the "out" flow to the heater core.

but then again, I would also think that the hose with the valve in it was the heater core supply side, but I suppose it doesn't really matter where the valve is on a closed loop system

unplug one heater hose and see which way the water is going with the engine idling and the hose end into a bucket.