I have the power steering kit in my 59. I also have a crate 350 so I have all the necessary drive pulley's and pumps to run it. the previous owner put it in and I don't really know much about it. I know I had to have a mechanic repair the kit when I snapped a component and he made me sign a waiver before he would let it back on the road. But I've never had a problem with it that I didn't cause.
Let me know if you need any part numbers or pictures and I'll be happy to help you out. My e-mail at home is
[email protected]The hardware kit is $95 from Chevy duty
http://www.classicparts.com/1947-59-Power-Steering-Conversion-Kit/productinfo/76%2D977/
They have a deluxe kit but it doesn say what it comes with
http://www.classicparts.com/1955-59-Deluxe-Power-Steering-Kit/productinfo/76%2D982/