Here are some shops that might be local they don't have complete Chevy parts like CD but if you are thinking about doing disc brakes CD sold the same kit from CPP for over $200 more. Here are the links ...

http://classicperform.com/
http://www.performanceonline.com/store/customer/contact.php

I have also had really good luck with Golden State Out of Nevada

http://www.golden-state-parts.com/

However I think I am going to start using American Classic for helping out with this kick A$$ website.

Just start surfing through the links that are provided by stovebolt!