I installed the American Autowire harness in my '67 bird a few years ago. The wires are well marked and heavier where they need to be. They are also longer so you can re-route & hide them if you want. There are plenty of circuits for all of the factory options & extras for any add-ons. It also comes with all of the factory style (Packard 56) terminals.
When it comes to the Packard 56 connectors, don't bother buying an expensive crimper like the directions recommend. I tried several different crimpers and none of them worked as well as I would have liked so I ended up using crimpers like these.
It takes a little bit longer to crimp a terminal, but you get a better crimp & the terminal wont pull off.