Dilivar was used from 78-82 1/2. Then they went to the coated dilivar. My spec book is 78-81 and shows the 33Nm which is 24.3ft lbs. If Bruce says 29 I would find the correct torque for a late 83SC before settling on 24. I put Raceware in and they state 25. I can check the factory manual later tonight and update if there is a difference in the late 83s w/ dilivar.
I got the dilivar info from this website.
http://www.weissach********.com/guide.html
See the engine section.