Wiring identification preference?

I’m looking at trying to clean up the wiring in my 66 Dart, but only a few circuits need new wiring. I’m just replacing a few wires, removing a few suspect spliced-in wires, and just trying to route and bundle them in a more logical fashion. I’m wondering what everyone’s preference is regarding labeling wires? I’m hoping to label each end of each wire for future, and don’t know what’s the best way to go. Something small and unobtrusive but easy to read, (my 50 year old eyes aren’t so sharp anymore).

Thanks!