Order of assembly? From a bare shell

Normally the suspension, drivetrain, fuel, and, brake lines and everything was installed minus the wheels after the shell was primered and painted as a bare shell. The asphalt based undercoating was sprayed in the wheel wells after everything was installed.

I say this because having dissassembled a bunch of these cars I find the areas where the rear spring mounting brackets attach to the body, the spring mount brackets have undercoat overspray on them, but theres nothing underneath them where they bolt to the body. On the body side where the mounts attach all I ever find is primered steel with paint overspray on the body side where they mount, also you will see some minor undercoat overspray on the brake and fuel lines from the rear wheel house area at the framerails on both sides. Ditto w the K frame.

The factory never undecorated the whole car. They only shot the front and rear wheelhouses as a sound deadened, a cushion from pebbles being flung up at the front fenders from inside the wheel well to prevent small outward protruding dents in the front fenders, as well as to slow down the rust demons from getting in the seams.