300sd engine swap...parts replacement recommendations?

I am changing the engine in my 82 300sd (due to low compression on one of
the cylinders/poor starting in ontario winters). I want to be sure I do
everything that should be done while the engine is out of the car.
I have ordered the front main seal and a bunch of other stuff.........but
I see no mention or guides available for the rear main seal. I'm not sure
if the engine being transplanted should have a new rear main seal, or if it is an easy job....... or not.

Anyone with any experience or info on this?

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