If the car doesn't have housing floaters, they will bind up in a turn. The leaf spring just has too much to do if it's bolted solid to the rear end housing!!!!! With the floaters and ladder bars, then all the springs do is hold the car up and the shocks and anti-roll bar do all the suspension work!!!! Should I ever get the '57 done, you should come over and take a drive in it!!!!
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I tend to get a bit carried away and spend waaaaaaaay too much time and money on my own cars but I want them to be equally capable on the street, strip, and through the curves!!!! Always a matter of compromise to get a car to work well in all 3 situations, but it sure keeps the old brain busy during the course of a build!!!!!!