Is there any way to tell if the engine has been swapped? To my untrained eye, it appeared to be original (looked at it from both the top and the bottom).

And the car was originally black, as far as I can tell. I don't have much of a history on the car, other than that it was privately imported by the previous owner's grandfather. They did a terrible job repainting the car. As soon as I get everything in working order, I am going to start the 'strip and redo everything' method of automotive body repair...

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1984 300D (Turbo)
1949 Dodge B-1-C 3/4 Ton truck
1985 Euro w123.130 300D (Naturally Aspirated)(bad transmission)

I have studied many philosophers and many cats. The wisdom of cats is infinitely superior.--Hippolyte Taine