How to Move Shackles in 3"

I was reading this: https://static.speedwaymotors.com/images/charts/Slider_Tech.gif I think it's more than I want to get involved with for a street/strip car. The stock hangers will be a pain installing, but I think I'd rather have them, as they are almost no maintenance.
I do like the idea behind them. Thanks again, abdywgn.