Here some pics from a 68 Camaro, should be the same for your Chevelle.
http://www.diynetwork.com/diy/ab_brakes/article/0,2021,DIY_13682_2276024,00.html
Good luck.
Mike
http://www.diynetwork.com/diy/ab_brakes/article/0,2021,DIY_13682_2276024,00.html
Good luck.
Mike