I run 30 inch M&H slicks on my 65 Belvedere with SS springs and hangers from Mancini.Plenty of clearance.You could use the stock hangers and drill the springs back an inch to center the rear.But if you do you will have to redrill the rear shackle hole.With the stock front hangers either way the rears will be an inch short from where they are supposed to be.Rocky