To get that kind of mileage out of a car you have to pretty much replace everything, several times over. The body shell is probably all that's original and some of that probably isn't I'm sure its been hit.

Going by what Craig ran into with his 300D, figure on a motor every 400k-500k, and a transmission every 200k-300k...and just about everything else in between.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200