Electrical System Flunked

My goal with this car is to have it be a worry free fun machine pretty much. Not looking to put restoration quality work into it. This is my first project, and I just want to have something fun to drive around in. I want everything to work, but the world won't end if I put parts on it that aren't original.

In my opinion you have two choices with some options within each.
1. Get a decent engine harness from another '74. Check it over, Swap it out.
2. Rehab the existing wire harness. This will be a project. In part puzzle, part learning experience.