Body harness wiring

[Ghost's68]

What’s up everyone!

I posted this question up under general but I wasn’t able to get the answers I needed, so I’m posting it on the swap forum.

So I got a LS3 and 4l80e swapped into my 68. For the engine I’m running a Modern Vintage stand-alone harness. I pulled my bulk head off the firewall and want to clean up the wiring.

There’s a top part and bottom part. It appears the top section, the only wire(s) I need are the starter wire (purple). Is there anything I need to keep?

Bottom part, I’ll be keeping the headlights, turn signals. The red wire that goes to the external voltage regulator and AC unit can be deleted? What about the fusible ground line tied into the hot?

For the alternator, I was told to just run a 10g from battery to alternator. Does that sound correct? Also what’s the top circled wires for? Do I connect that to something?