I used them on my big block using brackets from a 94 S-10 Blazer V6 Chevy truck, these do not have the smog pump and are a cleaner bracket, it is especially nice having a late model alternator and A/C. I used some weatherhead adapters from NAPA to adapt to a 69 Camaro power steering pump. The fit was excellent and I highly recommend them.

http://i52.tinypic.com/2whgrno.jpg