Cab forward wire harness help

[Maxian]

You guys have been awesome so far so heres another question.
Dug out the engine compartment harness and I'm not sure what came with the truck. As far as I can tell it came from a vehicle with 4 headlights. My 69of course has 2 headlights.
Not even sure it's remotely for t his truck. Not sure what that power bar is or where it mounts. ( Close to or under battery tray??)
Anyway, can somebody explain what I have and wil it work in my 69?
Few factoids.
Truck will not have heat or A/C, so we don't have to worry about those wires.
Will be internally regulated, so those wires can go.
Will have a HEI, so points etc wires can go.
Will still have factory guages so I'll need temp sending wire.
Can somebody post a diagram or a link to a diagram?
Or pictires of what that power bar is, or where it mounts, and what it hooks to and how.

Thank you, many times over.