So I pulled the engine from the 300SD, which is turbo. And the engine from the 77 300D, NA.
Got the engine somewhat clean, and went to swap the pan, because I was not going to add the turbo. to the 77.

Well... the pan will not fit. I do not know what do now. Give me your recommendations..

1) put the turbo engine in the 300D and just block off the oil return lines somehow. This was a good running engine.

2) the NA engine has a massive leak from the back, near the rear main seal. But it looked ok on the pan side. I have not removed the flywheel. Also this engine had low compression. But that may have been due to running WVO on what was mostly a single tank. It had compression around 100psi before I removed it. It would not start. And I still do not know where the oil is coming from. I sat the engine on the flywheel to remove the pan, and the flywheel was covered in oil before I got the pan loose, so It will still have that issue with the new seal just in the pan side.

3) throw in the towel, and get something different.

I would like to get the 300D running, as it is a very nice car inside, and body wise. But I am very frustrated right now. And do not know how to proceed.

All I have done is major repairs to cars for the last year. ARGH!@%T

thanks

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83 300SD Dark Silver Dark brown inside