Is all of theis factory wiring or a replacement harness?
"orange with black stripe and hooked end"
On my 67, the hook meant it went into a plastic casing, normally for a glove box light or console light, etc..
The brown wire has lots of possibilties, accessory power, A/C switch, cruise control, etc..
If you didn't start this work, maybe it's miswired by someone else?
I just tackled what I could figure out at a time, and the pile SLOWLY got smaller and smaller and finally the items left only had one place to go, and I"m almost done.
Good luck and buy the color coaded wiring diagram,
www.Classiccarwiring.com
Scott