reddevilriver.com makes harnesses for 3.8 GM V6s. Check them out.
Yes, it requires transmission, engine wiring harness and computer from donor car.
The Chevy supercharged 3.8 liter engine will fit into the Chevrolet Monte Carlo. The wiring harness will need to be changed.
if factory wal mart sells wire harness and it does some after market serios
you should be able to.the only thing that might be different is the wiring harness
go to maliburacing.com search wiring diagrams
You should never have to replace the wiring harness, and if you do get a professional to do it. Now if you are talking about the wiring harness for a after market head unit, then you just buy an adapter. AND ALWAYS DISCONNECT THE NEGATIVE BATTERY CABLE WHEN MESSING WITH YOUR CARS ELECTRICAL SYSTEM.
It really depends on the car. If you change the hood it will easily fit depending on the size of the car and the motor including the height of it. The wiring that you would change or move would be just pretty much the sensors that would be rewuired.
get the after market wiring harness
Easy way is to go to best buy get you a wiring harness that plugs into your factory harness.
To do it correctly the speakers will have to be rewired and a new wiring harness installed.
There is a wiring harness most everywhere you look on that and any vehicle. Be more specific.
You have to buy the wiring harness for the new deck the connect the corresponding wires