I've always had good luck making leaf springs work on the street....I learned early on that housing floaters, ladder bars, and good shocks are what it takes. I'll run the composite (plastic) leaf spring on the '57, kind of expensive but so much lighter, perform better, and maintain their rate much longer then steel springs. I had them on one of my Mavericks with double adjustable Pro shocks for the strip, changed over to a non-adjustable shock (like 3-6 valving) for the street. With housing floaters, all the leaf does is support the weight of the car and doesn't figure in at all, other then having the correct rate, on how the chassis works......