If your engine was supposed to have all the valve cover gizmos and the EGR you would see threaded holes on top of your valve cover between the linkages and the oil cap where the related 3/2 way valves and such would the mounted. There aren't any threaded holes that I see. So I agree with the previous post that your car never had all that stuff. Most of it is a huge source of vac leaks anyway, and tends to get blocked off.

Here is my 82 300TD engine. Your valve cover setup is quite different. The linkages aren't the same.

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