So I picked up one of those and they do fit well. For the harness I got, they ran the horn and washer wires together with the alt and distributor wires so I separated them with a knife and re taped them with some friction tape so they looked like my original and ran separate along the firewall and then the passenger side of the compartment. It is also a good time to add a hot wire for the carb if you opted for one with electric choke. You can connect it to the double-blue on the ballast connector.
While you have everything out, you may also want to consider replacing the front headlight wiring harness too since it is not that expensive and it contains the wires that connect the bulkhead to the battery and starter relay as well as the front lights.
While you have both of those new wire sets, you my want to consider running direct wire between the alternator and the starter relay to take the load off the wiring harness in the bulkhead and then tape everything up so they look stock and far better charging and less risk than before.
I think I spent about $300-400 for both harnesses and I got the bulkhead bypass wire, fusible link and connectors from Mad Electrical. As a bonus, Mark spend about an hour with me on the phone and I learned more during that time than I would have ever imagined.
With all of that and about 6 rolls of friction tape your shiny new harness can look absolutely stock and provide far better charging and less risk than before. This is not a complete electrical repair guide of course but some quick general ideas that worked well for me.
