1976 Feather Duster comes with 383

In his underhood shots, the crimp is visible.
The trunk should be the same, but not all came with alum substructure, it depends on when it was produced. Mine is Dart Lite, and has a standard hood, 3 speed, and drums. It "should" have alum trunk, 4 speed, and discs.
I would love to know the production date.