SUPER STOCK or XHD LEAF SPRINGS?

I also have a question about SS springs. I have a 72 swinger and I mini tubbed and relocated my springs into the frame. I'm running 28 x 12 x 15 right now but I don't like the stance and would like to lower the rear of the car a few inches. Does anyone know how to get the rear sitting lower using the super stock springs? I was thinking about using a 1-2" lowering block or perhaps removing a leaf or 2 but I'm not sure how that will affect it since I will be at the track sometimes. Are lowering blocks allowed at tracks? Will just removing a leaf or two lower it much and will it still be able to handle some abuse if I do remove 1 or 2 segments? I'm not digging the 4x4 look anymore but was hoping not to have to buy new springs or go to coil overs to resolve this.