If the engine has been updated I would buy it. I like the W140, just remember it is a W140.

They all seem to need evap cores at some point in their lives figure $3k.

The heads on the 350's are fine in fact if your 603 cracks its head one from a 350 would be just fine. But the rods can bend. I think you are taking a 50/50 shot when buying one.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200