I believe that someone who knows the breed can mate the engine and transmission combination to the chassis, if these are both 123 cars. Since you have both complete cars, I'm convinced this could be done.

Your biggest problem is the change in glow plug systems. I placed a serial glow plug in my original parallel glow plug chassis temporarily. I used a window switch put in the dash for a momentary contact switch which actuates a Ford sarter relay, which is cheap and capable of handling high current, to operate the glow plugs. There is no fancy light or sensor to tell you when the engine is ready to start, but I get along with it just fine. I hope to get my original engine finished and back in the car before too long.

Hope this helps,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles