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After 96 should be OBD-2. My truck is a 95 and it is OBD-1. As I understand, any small block for after 96 equipped with Calif. emissions will have mass air. I am not sure on 460's as I am curious too. Hopefully someone has a better answer then I do.
96 & 97 California modles have SFI MAS AIR and they are OBD2. The 97s are the only 460s to not come with air injection from the factory 96s and back had air injection. I have also herd but cannot confirm that Massachusetts got MAS AIR also. If you look in my gallery I have pictures of a 97 with MAS AIR.
Leadmic