[Walt Fricke]

Yeah - little white spec books. NLA, I think. Super useful.
However, Wayne Dempsey's book covers about everything, and Bruce Anderson's book covers a lot.

And remember that the shop manual began as a 2 volume set, which was then supplemented by a four volume set which updated things through the end of the SCs. The first two volumes covered a lot which wasn't repeated in the follow up sets.

Did Porsche put out something similar for the 964/993?

Torque values are critical only for some engine fasteners and transmission parts, and some suspension parts, though. You don't need them for body parts and the like.