"As I recall, the 68s came with a 2:93 rear when ordered with YS engine, Turbo 400 and a/c. The 69s came with a 3:23 rear gear. "
Do not have any '68 info here. The AMA sheets that I do have for '69 GTO (vin #242) are as follows.
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> 350 horse 400 "standard" engine = 3.55 for manual, 3.36 for auto, and 3.23 for a/c equipped cars
> 265 horse "regular fuel" 400 with 2-bbl = 2.93, 2.56, 3.23, and 2.78 for a/c equipped
> 366 horse 400 RA3 = 3.55 for both manual and auto, with 3.23 for a/c equipped
> 370 horse 400 RA4 = 3.90 for both manual and auto, no a/c available
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