I'm not sure what kind of parts you are looking for, but the following places have helped me out A LOT:
Year One - 1-800-YEAR-ONE or
www.yearone.com They have a book for 1967-1981 Camaros
Classic Industries - 1-800-854-1280 or
www.classicindustries.com They also have a Camaro book
And try ebay. I've purchased a couple items from sellers and have had no problems.
Good Luck!
Bill
1967 Caprice