I guess I'm gunna have to REVISE the 66/67 SS Fact Book

I'm showing KK code as 4.10:1 posi for both 66 and 67 SS, and the MYSTERY CHEVELLE had a KK ( 4.10:1 posi rear )too.
and I show CU as 3.73:1 posi.
and I still don't see how based on whether it has a KK or CU code, you can reach a conclusion as to which HP engine it had??

Rears/Gear ratios were Options in 66 and 67 SS Chevelles.