|Some of the components in that kit are non OEM for the base price of $425. Once you start upgrading to OEM parts (ARP studs), price goes up.
As of now the the starting price is $485 because CZP is out of the "CZP branded tensioner" so you have to select the OEM tensioner for an additional $60 (which is not a bad idea anyways).
If I were you I'd contact Bernie for a complete kit, thats what I'm doing when I do my next 120K
Hope that helps.