That olds is an X-frame car, correct? If so, any '58-64 impala kit will work
My brother has a kit on his '60 impala from "Auto City Classic" in Isanti, MN.
It uses a bracket that bolts between the stock spindles and steering arm (moves steering arms inward the thickness of the plate... toe-in needs to be set after installing) and Camaro/Chevelle 11" rotors and calipers. I think it also came with a Camaro/Chevelle master cylinder, and a new 9" booster.
*edit* (almost forgot) welcome to Lateral-G
