MHS has some Stage 2 and 2.5 NPI specific cams that do not require much in the way of supporting mods. Anything higher than that will require a lot of mods. The stage 2's you could literally just bolt on and go. The 2.5's you should probably upgrade to the PI intake manifold, or an aftermarket intake manifold.
If you know what you are doing with the install, then, having MHS degree the cams before sending them to you would be easy, and then you can just drop them in with the TFS adjustable crank gear set. You would then have to get a tune to use them, but really, not much more.
That is a lot of money, time, and effort just for sound.