do you have a pic of your 77 el Camino?
i sold my 77 to a guy in Houston (Blue Bastard).
i know it is a long shot, but i have seen stranger things.
it was two tone blue, dark/baby, with the aluminum trim separating the colors. it had a custom seat, with wood grain console and custom headliner/door panels, and rally wheels.
i sold just the shell (no motor/trans).
could it be yours.