It wouldn't take much to make this car 'pop': Paint the tail panel the correct Argent, add wheel trim mouldings, add the wood trim on the door panels, find the medallions for the seats, get the correct headliner material (heck, i could even live with the woodgrain overhead console), wrinkle finish black the air cleaner, and add the GC trim to the grill & paint it the correct Argent.
The 383-4bbl was the largest motor you could option on the Gran Coupe. It wasn't the Magnum 383-4bbl found in the 'cuda, but it was close: 330 hp versus 335 hp.
I'd suffer with it!!