Cylinder head discussion 340 with stock above deck pistons

I would avoid the snubber and the extra leaves. I would work on getting a quality double adjustable rear shock when you can. Most cars (including mine) are over sprung. The shocks will do a ton more for you than a snubber. Snubbers are not subtle. It will just bounce the tire. All they do is create body separation in an uncontrolled fashion. The A body from spring segment is so short you REALLY need to be hitting a BIG tire hard to get axle wrap.