Thanks for the input guys.

Quick update.

The SD I've found is a W126. It has the OM617, and only 78K original miles. Basically, I'm waiting to hear if the elderly lady who owns the car is ready to sell. Her husband passed away sometime ago and she's been looking to downsize to a car she feels she can manage better. Will post pictures if this pans out. I'm not worried about spending a little extra money for a lower mileage example. I know with mine, there were more things to fix immediately, and I think my father is looking for a car to get in and drive basically right away. He loves the feeling he gets from driving my 300D, and I think he wants to capture that in a bigger package.

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1985 300D
1987 300SDL
1970 Jaguar E-Type OTS
2002 Dodge Intrepid (Traded In)
2011 Ford Crown Victoria