Did you read it as they are wanting to sell the engine only?
I did at first, but I think it is meant to be:
2005 Chrysler Crossfire SRT-6(semi colon) Engine: 6 Cylinder 3.2 Liter - $9900 (Lombard)
meaning that the engine in the crossfire is a 6 cylnder 3.2 liter, selling the entire car, not just the engine.