Just bought a 5.7 for my Duster

Hello,

I wouldn't worry about the model year with the exception of the MDS which in-turn changed the engine from a 8 to a 4 by turning off the lifters. Works well. The 2003 did not have the MDS. It's no big deal. It can be turned off and all is safe. The nice thing about the truck serpentine belt is the clearance for the A/C. Currently there is nothing available for conversion. The belts underdrive the accessories and are designed that way to begin with. I would talk to Ben at Plum Floored Creations www.plumfloored.com (623) 986-5000. He has done many of these conversions. Also try http://www.hotrodlane.cc/New%20HEMI%20Tech/HEMI%20links%20page.html#hemitech. They have a lot of product and support.
Intake go with the Mopar Hot Rod style manifold. EFI with center mounted throttle body. Makes for a clean install.
Computers: Their are stand alone that does not require the OEM ECM
Cams: Try Comp Cams or call the B.E.S. Racing Engine they won the EMC with a late model HEMI. http://www.forabodiesonly.com/mopar/showthread.php?t=125247

I am in Fullerton, would to check the car out...

Thanks