Thanks for the advice on the flywheel balancing. The box I can get locally is the cast iron one most likely from a W115. I did find a shifter that is available from a seller in Chicago. I would still need to find a driveshaft front section and flywheel to more or less have all the bits to start with. I'll call the local machine shop and see if they can balance the flywheel, I'll also have to find someone to cut/balance the driveshaft.

Maybe what I really need to find is a therapist, my 79 300D with 87k mile on the clock is a near mint original and the auto trans works perfectly. Why can't I leave stuff alone?