Wiring question

[OldChevy61]

I ve almost got the outside of my cab stripped and ready to strip out the dash. I am going to be doing a complete rewire when reassembly happens. Question is ,do I need to be concerned with the old harness. I want throw it away,but just can't see labeling all those wires if I'm going back new. In my mind,just rip it out and keep going. This is assuming the new harnesses come with everything labled. Also reccomendations on a new harness. Thanks