Now, now, ladies....
Truth is, there's nothing wrong with the way John writes, so if you somehow see offense in that you must, in my uninformed humble opinion, be pathetically sensitive (or just a dick).
The OP asked about a supercharger kit that is no longer available. Had the kit been a roaring success when it was current they would have sold lots of them and they would have redone them and continued production after their tech info was lost.
The fact is they didn't, so the kit probably wasn't that great. I can see several reasons why that might have been, torsional vibration on the long drive shaft causing belt issues, noise etc etc being one problem I see as having been pretty likely. Intake temps would have been crazy too, without a doubt.
The OP was asking about superchargers, and GMC sell them (I am making the assumption that they still do, but I think they do) so why shouldn't GMC offer some info with respect to the OPs questions? I see no problem with that myself.
I have dyno'd several of their Rotrex blower kits and they work well, plain and simple. I personally wouldn't do the fueling and ignition adjustments with 'add-on' boxes, but then I have the option to do it with bigger injectors rather than an additional one, and the boost retard can be done with the car's original ECU in a more 'factory-like' manner. However, I have equipment and software available to me that very very few other companies do, because I need it to do my job properly.
Please accept my apologies if any of my grammar or punctuation is offensive to you, but the truth is I spent every English language lesson staring at my English teachers arse than actually listening to what she was saying....
, i will contact that company. I already own a new compressor, and offcourse i will attach a intercooler. 
