This is an interesting debate that has not answered my question. A question that stems from our interest to convert one of our 300TDT to 3 pedals. My conclusion is to just go for it. More research and parts gathering to do, but the big parts are about to be acquired.

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.