I had a look at my 72 and my take on your wires is:
Picture #1 the red with white dots wire connects to the red with white stripes wire in picture #2. That wire should go through the parcel shelf to the rear window demister
Picture #2 there should be a grey wire that connects to the rear plate lights via a pair of wires clipped to the lhs engine lid bracket (brown to earth, maybe that brown with white dots wire that seems to connect to the earth stud?) Also there should be a grey with white dot wire that connects to the solenoid on top of the fuel filter assembly.
Can you help me, in the following copy of your picture, is that the connection to the fuel pump that I have labelled? If so, can you please tell me what route it should take to get to the fuel pump, a photo would be great, your last photo is a bit blurred and I can not make it out.
