The foundation for a 5.7 Swap

As far as electronics you've got a number of choices.

Options #1

Use the factory computer with a modified stock wiring harness. Street and Performance (I believe it is the same harness as sold by hot-wire) sells a four wire, wiring harness to install a modern hemi with the factory computer, you can use a Diablo tuner to do some tuning. They need the VIN number in order to remove some of the anti-theft stuff. You'll also need to update your fuel system and install a drive by wire pedal assembly. The harness is between $1000.00 and 1100.00 plus an additional $250.00 to program the factory computer. If you go to their website they have a bunch of hemi install videos, not academy award winners but quite informative.

Option #2

Use a FAST or AEM system with a cable operated throttle body. Both of these systems give you complete control over the fuel and spark. Thus, you can run any cam, any power adder and tune to your hearts content. The AEM system is sold under the Mopar performance. The main benefit is that both of these systems come with complete wiring harnesses, and a known tune that will at least get the motor running. Price 3K to 4K.

Option #3

Use Megasquirt III, a DIY stand alone engine management computer that you can buy pre-built or build it at your kitchen table. (You'll save about $200.00 if you build it yourself.) Megasquirt can now utilize all the factory sensors. You'll need to build your own wiring harness. Gives complete control over fuel and spark. If you spend an extra 200.00 dollars on a wide-band O2 sensor you can utilize "auto-tune" that will do about 90% of the tuning. The big benefit is that you can build yourself a complete Megasquirt ECM and wiring harness for under $1000.00.

Option #4

Install a carb, there are a bunch of carb manifolds out there, including from XV Motorsports, Edelbrock, Indy, and Mopar Performance. These manifolds run about $500.00 MSD makes a stand-alone ignition controller called the MSD 6-Hemi Controller. They run $500.00 + $180.00 for a wiring harness. You can read about it here:

http://www.msdignition.com/instructions/Products/Ignitions/6013.pdf?
terms=88864

Add a holley carb and you're good to go. Total cost about $1500.00.

Hope this helps.

Regards,

Joe Dokes