Only a couple guys have swapped 2.0's into the J body. Even still, they did somewhat hybrid designs. I have not heard of anyone swapping the LNF so far. The power steering is an additional issue. All the plumbing would have to change. I recal that the LSJ tranny doesn't directly fit the J-body, so it's likely that the LNF doesn't either. The GXP's PCM is a new animal to us here in North America, there won't be too much help getting it to work in the J.
If you want to be unique and be ground breaking, it's a great project, but dollar for dollar you're far better off playing with the 2.2.
That 2.2 can take a ton of abuse. The Saab turbo and manifold fit the car and work well up to say 300 for a junkyard kit. Hahn is the man when it comes to the L61 and the turbo kit. If you are worried about it not being prepared for boost, throw in some decent pistons and rings and maybe a set of valve springs. The GM build books are online and have part numbers and various tested options. The engine as it stands will take well over 200 with no issue at all.
Go to J-body.org. You will find the most info there. I believe someone is currently working on an LNF bottom end in one.