Re: What is this harness and where does it go?
if your time is worth more than 25 cents per hour I'd buy a a new underhood and engine harness from AAW. Top quality stuff and regular supporters of guys here. They can update the harness for things like an HEI, electric choke carb and internal regulator alternator. Plug and play, no BS. They're on here all the time.
There's another vendor, M&H, that has similar quality product. They don't logon here and help guys.
I'd avoid any others, especially cheap ebay stuff and anything that might be Painful.
This stuff will reduce your work time from days of frustration to minutes. Don't ask how I know this.
Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.