I'm currently finishing up the panel replacement on a Metuchen-built '69 Mach 1. At the moment, I'm wrestling with trying to get the lower rear quarter, the trunk drop-off, and the outer wheelhouse to fit together, especially right behind the rear tires. The ultimate problem is this: when I bought this car, it had had all the aforementioned panels replaced. Some were fabricated (poorly), and some were reproduction.
I've attempted to reconstruct things the correct way, and I've replaced all of the parts with current reproductions. However, nothing seems to fit, and it seems like either the trunk floor drop-off is too short to correctly mate with the lip on the quarter panel, or else the quarter panel patch is too long. Can someone provide pictures of an original car? I've never fixed a '69 before, and I've nothing to use for reference. I've noticed that a '69 Weld and Sealant manual isn't available, but a '70 version is.
Again, I can make all of this stuff fit together, but I want it to look like the area's never been touched. I believe in doing it right, or not attempting it at all.