I'm with meter swinger on this, my 59 has mono leafs all round, its soften the ride a little & dropped it heaps but its still a handfull to drive in traffic, its hard to cruise & relax on the road.
I'm also in the process of building a 56 GMC that I Camaro clipped about a year ago & after seeing the new Porterbuilt I think I did the graft a year too early
Anyway hopefully it will drive nice & smooth with the luxury & safety of IFS, PS & power disc brakes.