I just finished a bumper to bumper rewire of my 71 Charger (I know, I know, not an 'A' body....) using the American Autowire harnesses. While I wouldn't call the project 'easy', it also wasn't hard, just time consuming. The documentation is mostly clear, and where it isn't they have excellent customer support. You have to know how to crimp, if you don't have crimpers buy theirs when you get the harness.
