The 2.7L V6 Chrysler engine is by far one of the worst engines ever made. The Chrysler equivalent(if not worse than) the 3400 GM motor.
Anyways, its typically a 8-10 hour job and will probably cost between $700-$1100 for a head gasket job.
My advice is to buy the parts yourself, you can get a gasket set pretty cheap and then you don't have to pay the mechanics mark up price. The labour is what really kills you in head gasket jobs though since it is such a lengthy process.