As a high mileage SRT6 owner it is critical that you look into a few things on the service side before you jump in. The standard stuff applies here as it would with any car; plugs and wires (100k service interval), trans filter and fluid (80k service), Tires (at an avg of 20k for the rears 100k suggests tires are needed or were just replaced), filters (fuel, cabin, air, and trans), and shocks.

If the vehicle was maintained and not raced or tracked then most of the other concerns go out the window. I am at 145,000 miles and aside from typical wear items (some bushings, tires, filters, and fluid changes) the car runs like a champ.