Heater Hoses Mess..cry for help from the Uk

[UkMark]

Guys..68 gmc
heater is bypassed and the truck permanently runs with the old dash temp light glimmering..no thermostat inside right now which does not help, but the coolent are pumping round quickly enough.
the top hose on the manifold has been put back into the rad[rather than the heater], but i am thinking this is causing issues, i intend to sort the heater matix rad out and re-connect[i need a heater!], but the waterpump doesnt seem to have a bottom left plug to connect the other heater hose back into it..
the truck hasa 72 bed on it, and i assume the engine is not 68 either, some advise would be much appreciated.