What wires can be removed after LS swap?

[Ghost's68]

Hello everyone,

I just dropped my LS/4L80E into my 1968 SWB. I removed the bulk head from the firewall to look for the purple wire that goes to the starter. Unsure how PO wired it since the original wire was cut to about 8” and tucked into the wiring.

What wires can be completely removed? Truck has no AC and running a ModernVintage stand-alone harness.

Is there a wiring digram that shows an LS swap?

I removed all the tape and wire loom because I want to terminate any unneeded wires and to clean it all back up before putting it in. Any help is appreciated.