"I recently ran into major problems trying to use Goodmark's "Authentic Reproduction" Dodge B-Body outer wheelhousings on my 1969 Charger 500"

What a joke. Mopar isn't worried that your part wont fit, they just want money from royalties paid by suppliers that want that "Authentic Reproduction" wording on their product. Heck, they probably dont even know what a wheelhouse is The AMD stuff I have used is awesome and is a great addition to our hobby.