some international help?

not sure if this will help but. this info is taken from v6supercharged.com

22. Qu: Can I convert my standard Ecotec engine to Supercharged by simply adding a second-hand Eaton M90 Supercharger?
Ans: We get this question quite a lot, and while we don't like to discourage your enthusiasm to supercharge your standard Ecotec motor, we would still however advise against it. Before we get into the technicalities of it all, we'll share this precedent with you. The main reasons being relating to cost, but the other related to performance. Here's a summary:

The heads and manifold are different, so you will need to purchase and fit them. Heads and manifold, if you can even get them, will be around $2,000.
The injectors and fuel rails are different, so will need to purchase them, at a cost of approximately $950.
Need a bigger fuel pump, and/or possible rising rate fuel pressure regulator, cost of approximately $600.
Bottom harmonic balancer is different, and is counterweighted so even changing it to the proper supercharged one will probably upset balance of engine. Plus you will need the pulleys and belt to go with the motor. Cost approximately $700.
Computer/chip is different, so you will need to get it remapped. Cost approximately $750.
Cam is different, pistons are different, rods are different, crank is different. Compression is too high, so even if you did do all of the above you could never get any serious boost into it to make it go like a proper supercharged one.
And on top of all this you still need to factor in the cost of the supercharger itself at approximately $1,500 - $2,000 they ain't cheap.
Add some estimate for labour allow approximately $1,500 - $2,000.
Total: $8,000 - $9,000 and remember you are still going to be behind the eight ball because it won't go like a proper supercharged one.
We have heard of a few guys that have done this conversion successfully, so long as they remain at a conservative 6 - 7psi boost level, and treat it well, it should last forever. However, if you try to increase boost pressure to much you may run into serious problems. We have now received a lot of feedback from the forums and emails pertaining to the fact that a lot of the standard Ecotec owners who have attempted this type of conversion have killed their motors and are now left with no motor and a useless pile of supercharger components. All the news is not pessimistic though as we have a number of feasible solutions: If you really, really want to go supercharged and wont settle for anything less here are a number of options:

Speak to Castlemaine Rod Shop (CRS), they have a cheap alternative at around $1,500 - $2,000 where they use a Toyota supercharger. It won't ever go as good as a proper factory supercharged one, but they do offer considerable improvements depending on how much boost you run.
Speak to CAPA Performance, they have a range of aftermarket bolt on kits that might be up your alley. Bear in mind they are usually of centrifugal type where boost builds up as engine revs build up, which is different to the factory supercharged ones where you have full boost whenever you want it. These centrifugal type ones can go quite well, especially if you put an intercooler on it, but don't expect any change out of about $7,000 - $9,000
If you really want to go ahead with supercharging your standard Ecotec, go ahead, but be weary of what we have briefed you upon.
Purchase a proper supercharged engine from the wreckers (make sure it's in good nick, or comes with a warranty, be weary of ones that leak oil, look like they've had a hard life, fire damaged, or are known to have high kms).
Don't pay any more than about $5,500 for one as the other option is to purchase a brand new one from Holden, warranty and all, delivered to your door, in a crate, never even started for $6500 !!
Unless if you are really, really, really attached to your ride, the other and maybe best option would be to sell yours and purchase and already factory supercharged one " !! We like this option the best as it is a minimum of fuss. It's all there !! All you have to do is drive it !! It's done properly, no insurance hassles, no registration/pit inspection worries, transmission is already up to the task, suspensions all done, and to top it off it may be a better car than the one you had. You can probably trade up to a factory supercharged one for as little as $2,000, or as much as $15,000, depending on what you have to trade with and what you're trading up to, and what sort of deal you can work out in between. All you have to do is the supercharger boost upgrade at $695 and it'll go like a rocket !! Sometimes it pays to have a good think and do some homework before you jump into something you might regret. Either way you decide we are here to support you all the way, and wish for the best in your quest for supercharged supremacy.

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Forced Induction Technologies - Australia's V6 Supercharged Specialists