Big difference, KA is a Cast Iron block vs Aluminum. Just like Evo guys like to use ARP studs as well, again Cast Iron Blocks wont have the same issues with threads pulling out, distortion and so on that aluminum blocks will have.
Again if I were you I would at least ditch the arp head studs and Cometic gasket.
Other than that you say you took care of the bottom end. Thats fine and will work fine. But not the head studs and gasket.
Its your build and up to you. You might be fine or you might have problems. Some have had luck with those parts others have horror stories. Why take a chance when you can get parts that nobody has horror stories about????