As for the starter: Positive battery cable to starter large stud. Ignition switch start wire to starter S terminal.
As for incoming power for various components: Fusible link attached at battery positive, other end attached to a 12ga wire which goes to the horn relay battery terminal(s). Those terminals act as a power distribution point to various components. I added the fusible link.*
Unconnected unknown wires: They may be:
1. Old resistor wire. This is now abandoned.
2. Incoming power wire.
3. Old coil wire.
4. Seems like they were on the old starter, so maybe no. 1 and 3. Neither would be needed because of HEI. So why would they have been connected to starter? That may mean a previous owner used the starter stud instead of horn relay and they are no. 2 wires.
5. Do you have the large, metal, three terminal, horn relay mounted to inner fender? or near.
Let me know if you need help with alternator. Provide part number and vendor of alternator.
* Fusible link: sold at local auto parts stores. You will need a 16 ga. It looks like a piece of wire with a ring tongue terminal on one end and a butt crimp on the other. They are not "just" a piece of wire, they are a special wire. The conductor will melt, acting like a fuse. Has high temp, fire rated insulation. They are sized 4 gauges smaller (higher number) than the wire being protected.
