Shackle reversal on FSJ

I am looking to do a shackle reversal on the front of my grand wagoneer. I'm not about to pay 200-3000 dollars for some brackets that I can make but here is my question. Do you keep the springs in the same location or move them forward to compensate for the shackle beign in the back. Also any other info on doing this would be appreciated. Thanks
 
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