Well... there's a ton of information out there for turbocharging the 5.0 in Fox and SN95's, and the turbo concepts, brands, and sizes will all apply to you. Where of course things will get challenging is shoe-horning that stuff into the engine bay - there's not a whole lot of room in case you haven't noticed. And of course all of the hot-side will require custom fabrication in a II so you'll either need welding skills or some serious $$$.
If you're planning on 450-500 hp, you'll probably want an aftermarket block (that's getting close to the limits of the stock block). I assume you've also toughened up the bottom end -- you don't mention what engine you're running but I hope it's a 5.0HO and not the old 70's era low-compression boat-anchor 302. You'll also need to thoroughly rework the rest of the drivetrain to support that much power. The RAD4 or stock C4 isn't going to cut it, neither is a T5. You're also going to need a new rear-end, 500 hp exceeds the old 8". Not to mention the
suspension and frame reinforcement required.
Long story short, you'd be planning a huge project, probably in the >$10k range. I don't think bits and pieces of advice are going to be enough, including mine. I've turbo'd my '95, and I've also turbo'd my '78 v6, and personally I don't think the II is up to that level of modification while still keeping it a street application. I think you'd be far better off picking up a Fox or SN95 and grabbing an off the shelf turbo kit.