1976 Dart Overheating and other issues

The orange hose from firewall to front of engine is one of your heater hoses. The black one next to it is the other heater hose.

Just have to ask... Do you have radiator fluid in the engine?

A quick check to see if the thermostat is opening. Cold engine, remove rad cap. Start engine, idle till hot, look for water movement in the radiator