Originally Posted by POS

Yes. Barry Taylor told me he knows of two AMG w123s that did not have the 5.0 (mine is now the third on his list), Richard Buxbaum (ex-Pres/Founder of AMG of NA) told me they exist, and Al Mahanna (ex-owner of AMG of Missouri - my car's importer) said that all 6-cylinder cars that he imported had at least an AMG cam and an LSD; he also stated that he didn't remember importing many 6-cyl cars.

Yes, Virginia, w123 AMGs with a M110 2.8 do exist, and as far as I can tell, I have one (I'm still missing the original Bill of Sale, but I'm getting closer to those papers). Look at the brochure on the following page and it shows the AMG engine kit for the M110: http://www.geocities.com/johan01.geo/AMG/

PS - Option code 256 is the code for the w126 limited slip - that was easy to find.