You can move your shocks inboard, but if your running a full exhaust this probabley won't be an option. I tried to do it on my car and the exhaust pipes were right in the way of where the shock would go. How bad is the shock hitting? I did this on a nova I had, since there is some room between the shock and the leaf spring, you can make your own lower shock mount by either cutting and re-welding the lower shock mount closer to the spring, or what I did and make a hole new lower shock mount. I took some 3/8" steel and drilled holes in it where the U-bolts go through and the center hole, I did this using the original as a template, and make a tab for lower shock mount. Bolt the new plate under the spring and bolt the shock to the new tab. Move the shock as close as you can to the spring, allowing a little clearence, and then weld the shock mount. This might give you 3/8" to 1/2" of extra clearence depending on you vehicle and shocks, and might solve your problem.
68 468 700R4