A C code is a 289. Unless you are really into original numbers matching stuff for MCA shows, then a replacement would be ok. It is all a matter of personal preference. I have replacement heads (period correct) on my 289 - am I worried - not really. I also added a Edlebrock intake and 4 barrel carb (and kept the original ones).
Everybody has their own way with their CS, but it is nice to know it is a real CS. That brings us to the Marti report. The ONLY ways to tell if it is a real CS is to have the original window sales sticker, or at least the basic Marti report (minimal cost). I believe all you need is the VIN. And for a few extra bucks they can expedite it.
The consoles (top and bottom) were an option. They would show up on the window sticker or Marti report. Many have added them because they like them. My CS did not originally come with a top or bottom console, but they were added. I have kept them because they look nice and they are period correct.
Casey