67 barracuda notchback restoration

View attachment 1715089470 The goodmark panels do not have great body lines in them. You are better off to keep as much of the factory lines as you can. For the body line that goes from the lower side of the door into the quarter line it with masking tape on the door and quarter to help with getting it aligned properly as it is pretty light and hard to see. I curved under the two upper body lines when doing mine to keep the factory correct ones there. Also not a bad idea to throw the filler tube in the hole to be sure it comes close to lining up properly. I have heard where they were off a bit on some stampings.
Looks like you have a 1/4" gap between the door and rear quarter on yours too. I heard the goodmark ones dont fit super perfect, i like your idea of bringing the cut down to preserve the upper lines.

A few questions.

1 did you butt weld the panels or flange weld them with joggle and an overlap?

2 did you use the whole goodmark panel where it meets the valance, or did you cut it there too and seam it back with the stock panel?

3 how far back from the original panels edge did you go at the front by the door and the top? It looks like 1" back from the pic.