A turbo is probably a more practical option for the 3400. I bet its actually cheaper to turbo a 3400 than find a way to supercharge it.

 

yes, it would be way cheaper.

 

Not trying to be mean, but if you're looking for a s/c V6 in your car- this is the way to go. I bet even if you did find the RSM kit or the M62 kit for sale that it would probably run the same price or more than a whole L67/4t65HD. I mean heck, I've seen totalled GTP's selling for $1k or less now (I paid $1500 years and years ago)- I just don't see you being able to touch a decent condition, rare SC kit for anywhere near that price.