1967 Dart trunk area floor pan question

Your very welcome. Glad to help. I use a pneumatic panel flange maker I got from harbor freight. These are about $38 and worth having if you plan to do a fair amount of metal work.

You can butted it on 3 sides, then overlap spot weld it where it joins the trunk floor, and once ground down and seam sealed, nobody would ever know it was ever patched