Phil,
Your seats will be top notch when our interior guy finishes them.
Are you missing the RH side "300 Deluxe" emblem?
If your not needing any paint repair I would take your car to a "Painless Dent Remover" to have the few small dents repaired. Get new tail pipes, the ones that tuck up under and are hidden for that sleeper look. I would not put "SS" exhaust tips on it. Remove those "Don Lightfoot" plastic cowl covers that never came on the car. Get new "Historic Plates" that read, "300 DX".
Hard to tell from the picture, but is the LH Side "Spear Molding" a bit bent up, you can have it staightened and polished.
Just a few items I see.... Love your 300 Deluxe Chevelle.
Dan