I have the same job to rebuild my carbs, so please can we have detailed video, also where did you buy kit from. You fan power really needs to come direct from battery and switched by relays controlled by the thermostat. Also they pull high current, so best to have thick wires and remove connectors, which corrode so best to solder wires direct to fans. current and connectors causes resistance which means heat ending up with no fan. I am watching with interest your progress, as I am a long way behind you.

I take it your oil pressure sender is disconnected, otherwise you have a problem!