1970 Dart - decklid moulding install Q's

Let me ask you this;

Do you have the corner trim, that goes above the bumper, on each of the cast metal quarter panel corner extensions?

Here is what I have seen on the '71 and '72 Darts that had this trim ;

Each one had the decklid trim at slightly different heights on the decklid, against the edge, because of how the decklid fit against the quarter panels.

If I were you, I would install the corner trim pieces first, because they screw into the bottom edge of the metal, if I remember correctly.

Then, I'd get the decklid adjusted perfectly, with new weatherstrip, and put the trim where I wanted it, in relation to the corner trim.

When I painted the Scamp, I adjusted the corner extensions to fit the quarters nicely. This may also be something you want to do, before gauging the decklid trim against the corner pieces.

Basically, the idea is to just get the trim fitted where it should be, in relation to good fitting panels and extensions and put the holes where you need them, for your specific car. Each car fit up differently at the factory, when it was spot welded and bolted together and usually can use adjustment, anyway.

Hope this helps.