Really? Unless the 400k mile car is pristine, and it probably isn't with 400k, it's not worth the $3k plus to freshen the engine completely, plus other items (water pump, vacuum pump, alternator, transmission, mounts, flex-joints, radiator, ... you'll never run out of "while I'm in there" options). A 400k mile car in good shape is worth fixing, but it's tired and the first time it gets dented it's totalled regardless of the money put into the driveline.

Fix what's broken, the next thing to break will be the thing you didn't replace because you had to draw a line somewhere, regardless of what you've spent. I pretty much keep a spare 124 in my shop in pieces to keep Murphy's Law from presidiing over my cars.

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Gone to the dark side

- Jeff