W123 Tuning Specs and good repair manual

[big col]

Hi

I'm looking for the technical specs to tune a 1979 W123 2.3L carb (stromberg). (ie timing, idle speeds etc etc).

Also which is the best repair manual for this model?

Thanks for any help

Col

 

[240D 3.0VNTi]

Mercedes sells the manuals on CD for about US$20.