Welcome to the forums Sid,
Most of the parts you will need should already come with the engine, most of the work will be in the wiring and configuring the MS2. Didi you get part of the original harness so you can use the connectors?
* The Ecotec v6 uses a hot-wire MAF (Mass Air Flow) sensor or you can remove this and use the MAP(Manifold Air Press.) sensor built into the MS2.
* The v6 uses a hall-type CAS which outputs two signals so you will have to modify the MS2 for a second signal. Luckily the hall-sensors have a nice square wave output which is easy to adapt to. I used a simple transistor buffered input.
* The MAT and coolant temp sensors will work, just wire them straight up.
* You can wire the injectors to be fired in seperate banks. If you want to run semi-sequential injection there is a bit more work and you need to modify the MS2.
* The igniton system uses 2 or 3 wires to comunicate with the igniton module the has the 3 coil packs sitting on top.
http://www.megamanual.com/ms2/GM_DIS.htm
* There are also knock sensors on the engine but you might be better off tuning the engine properly so it won't ping in the first place.
Also have a look through the GM Success Strories
http://www.msruns.com/viewforum.php?f=8 ... 48d46023e3 for other people who have converted v6s.
viewtopic.php?f=74&t=22969
The trickiest bits will be the CAS wiring and working with the coilpack/ignition module but these have all been done before.