[TimG]

NCRS does not treat CE blocks any different than any block. The casting number must be correct for the year of the car and the casting date must be before the build date of the car to avoid a point deduction, period. If you have a '67 big block Corvette, the casting number needs to be 3904351. A 512 block would receive a 350 point deduction if it had CE stamped on it or if it had JE (435 horse L71 motor). They don't care if the motor was replaced by GM under warranty two years after the sale of the car or not. If you had a warranty motor that was replaced in a '67 Corvette six months after it was purchased and the block carried the 3904351 part number, but the casting date was three months after the build date, you receive a 175 point deduction. There is no special treatment for a CE block or a block with no stamping at all.
It's a very simple and fair set up. I'd be upset if some guy showed up with a '69 Corvette with a block dated one year after the build date of the car (CE block) and he received the same lack of deduction as my original engine '69 Corvette.