When i got mine mancini only offered one set for an a-body so I really cant specify what set I have.
here is my experience with SS springs others opinions may vary.
They work if your primary concern is hooking up. With my mild smallblock they made an open rear hook. Quite impressive in my opinion. One of the things people like is they are stone simple.
Here is the but. This is old technology. It works and works well but there are better options today. SS springs are biased to one side. Just bolting them in will raise one side of the car considerably over the other as well as raising both sides fairly high. This is not optimal for handling or cruising. The ride is fairly rough also on the street.
In the car with SS springs I now have a 440 with 3.55 sure grip. the axle is moved back and front hangers flipped to bring me back to the ride height i desire. with these alterations the SS springs are no longer enough to make the car hook up so if and when I do it over i will not use the SS springs unless i am building a cheap small block car for strictly drag racing.
there are pro's and con's to anything. make sure you are willing to accept the cons as well as the pro's before you spenfd the cash.
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Mazda 727C