i've been looking and can't seem to find a retailer for them. Since they are NISMO I'm sure you could get them through a dealer ($$$$) Since it's an OHC engine, installing the cams would be a breeze, but you would want to have at least some sort of open exhaust and intake. YOu get power by increasing flow through the engine, so you need to be able to flow more air.

As for the driveablilty aspect, I'd be more concerned with suspension and tire mods effecting that then engine mods. The only concern is emmissions (if your state tests) and gas mileage. I know a few people running engines in their daily drivers that I probably would consider strip only. One of them is a blown 408 stroker in a 98 dodge dakota. Runs 12's in the quarter but is still quite a good street car. Even gets 18/14 mpg (if he can keep his foot out of it.)