Check out the Jalopy Journal - "Hokey A$$ed Mesage Board" also known as the H.A.M.B.There is a thread about fitting them into a 57 sedan - they also use the S-10 Blazer springs for the same sort of purpose.
as an edit - the HAMB thread is by "FairlaneDave" and dated 4-26-2008....thread is "Cheap and Great Alternative......."