[Hypsi87]

I personally would not turbo the series II engine. The NA block has a low nickel content, which makes for a weak block. As far as a forced induction block is conserned. Good luck finding a GNX turbo.... most people tend to leave them on there GNX's a GN stock turbo would be your best bet. Plus you would confuse the hell out of your computer. If you want a turbo buick engine bad enough go the bone yard and get a NA 3.8. The only difference in the blocks is a turbo oil return hole. Your local machine shop can do that. Just swap out pistons. But then you will need the computer and coil pack and sensors etc.... I would just go find a TPI engine or maybe an lt1.