Just got into the Pony game last year and this was one of my first purchases. I installed the 5 Leaf Spring Kit a few months back and I have to say it was easy to install (getting the old rusty one out was another story) and they made a big difference. The stance looks great (not over the top). the ride is like night and day from the original leaf springs I took off. I'm glad I made this purchase and would do it again if I decide to restore another pony. 100% recommended.
This kit is great. Came with everything I needed and is surprisingly comfortable for a set of HD springs. I didn't realize how much sag had gone on since 1966 either. With this kit I gained over 2" in the rear giving my car a slight rake. My car handles better and looks better. If you are debating about new leafs just go for this kit, you won't regret it.