I have used this diagram for my 67 Coupe. It was originally a 6 cylinder. I have gone through every wire on my original harnesses and only found a few places where the colors did not match.
The only place that this diagram changes from I6 to V8 is at the dizzy and spark plug wires.
This is also the only engineering style diagram I have found. The others are very helpful, but are geared more towards assembly rather than troubleshooting.
"I'll fix it or break it, Guaranteed!"