I have added pictures of how to time the 1981/82 manually timed distributor on the 3.8 liter M116.960 engine to my web site, as part of the timing chain replacement page.

These start on the second index page at picture #21, first picture on the second index row.

By the way, the performance improvement with the new timing chain is quite noticeable - feels like an extra 10 hp.

Enjoy!