A Chrysler K engine?  A Turbo II isn't a 2.5L but rather a 2.2L.  I don't believe they ever used the engine in a N-S RWD setup.  The biggest hurdle would be to figure out of the Chrysler engine has a standard bellhousing.  I don't believe it uses the same pattern as the AMC which is a GM 60* Bolt Pattern.  I think performance wise, it's a marginal upgrade.  You might as well go with a Chrysler 2.4L World Engine.  You'll have to replace teh whole drivetrain but then you'll get a decent engine and can upgrade to a Merc 6-speed.