Yes they will , just change around the valve covers and intake from the new to the old.
No
The starter solenoid is on the starter. The transmission solenoids are inside the trasnmission.
As long as they are the same size and all the plumbing and eletrical line up. A 3.3 liter into a 3.3 liter, for example.
Yes
The motor will fit since everything is the same in the Intrepid from 1998 to 2004. There are 3 different motor sizes, 2.7L, 3.2L, and 3.5L. The motor mounts and the basic configuration is different...