If you are planning on building another Challenger some day, you may want to look into a fastener guide from MCC Detroit. The guide is $79 + shipping so if this is the only car you plan on building, it may not be worth it to you.
It's been a huge help to me since all my fasteners were thrown together in one big tub. I reference the manual all the time. Here's the link if you want to check it out.
http://www.iccahome.org/