When I bought my ‘69 RS in Nov 1991, the engine in the car was not the original - it was basically a 327 out of a 64 full size Chevy. In March 1994 I found a guy locally who was parting out a 69 Camaro that still had the 327 in it. I bought the engine and stored it until 2004 when I had it rebuilt. I then installed it in my 69 RS during restoration of the front of the car. I did not try to remove, alter, or restamp the VIN or engine codes.
So now, although the original engine is long gone I do have the correct engine in my car - donated from another 69 Camaro - and the engine bay looks totally original.
This is all well documented in the history notes and pictures I have on file so it will always be clear to a subsequent owner.
