In the 80s, "performance" rears were 8.5" 10 bolts had 3.42 (GN) or 3.73 (
H/O and 442). 7.5" 10 bolts had 3.73 in the Monte SS.
As far as parts book info, I can find 3.73, 4.10, and 5.00 ring and pinion gears for A body, but only for 1976 with 8.5" rear end.
3.23 was as deep as they went for 1979 A-body applications. But that doesn't always mean anything.
No 79 Olds model I can think of came with 3.42 from the factory. Nada. Zip. Were there any? Who knows? It's always possible. Technical documentation is proposed and written years in advance of the actual production year. The brochures and ordering information for sales can and did change, sometimes a lot. Which means, you almost could get a Turbo 81 Cutlass (hood is in the parts books) but no way in hell they actually made any for production. Same with the euro nose and Monte style mirrors on the 86 Cutlass. Never happened. And I think, although I'm not sure and not willing to pull out the CSM to look, the 442 in 85 had different gearing ratios in the governor/speedometer assembly. I could be wrong, but something wasn't passing the smell test.
I think this is just another anomaly that will go down in Cutlass lore.