My husband and I are debating on whether or not to do much more to his (79 300SD) car.
We bought it for $1500. Vacumm problems make the engine not stop unless the driver's door is locked from the inside and the engine allowed to die. None of the locks work from the outside. The servo is shot and bypassed for heat. Electric is really bad. Had it into the shop and the power disty module was replaced. It ran for one week. Now it won't even jump start.
The worst is the rust. There are several places when the rust has given us holes 1.5 to 2 inches diameter. Most near the bottom of the doors. Also in other places.
We were jacking up the car to trade out wheels and the jack hole crunched. Not completely but it will never again be able to be jacked there.
Just to make you sicker to your stomach, we've put about $3000 in it since we bought it including full front brakes.

MY car is a 78 300SD (as if you didn't know) and I'd probably take the brakes, the interior (nice and black) and several other things for my car if we decide to part it out or junk it.

I can get pics later today when I'm home and it's light to give you more info. I'm between a rock and hard place. $4500 is a lot to junk, but we could spend another $4500 and still have a car that give us a lot of problems.

Advice? be nice. He bought the car without me there to say no.

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Ginny in Denver-ish
78 300SD, 265K (mine)