From someone who just had his -14 head go through the slow, strange death spiral, and it is looking at a major parts bill, I would make damn sure that you really want a 603 powered car, rather then a 602, 606, or even a gasser (Blasphemy I know).

I knew about the -14 head issue, and rolled the dice on my 87 300D, the car appeared to be in great shape, there was no evidence of impending failure, and the paperwork showed the cooling system and the car in general to be well maintained. I decided that I wanted the car, even if it was likely that I would have to replace the head.

Now that I am actually faced with the expense of replacing the head, and the time loss associated with performing the work, I really wish I had not bought a 603 engined Benz. I am undecided on what I am going to do with the 124, but I think the 190D that it was supposed to replace, just may be sticking around in it's place.