Additional clues,
Orange valve cover,
Impala exhaust manifold,
You can see the washer for the strut where it goes in frame horn
etc.

My old Chevelle did have the bracket on RH valve cover. Air con worked as did the smog. Car even had PW and tilt.

You are correct Dave, I thought you were referring to my post. :blush:

No problem,
My old car was just a very dirty version of yours.
Quite the spaghetti mess with that car.