Background: Have a 53 Chevy pick up with Heidts IFS front. I'd like to get the rear level.... Drivetrain is 350/350/12 bolt . I purchased a set of Posie springs for the rear which have the offset centering pin and a 3 inch drop. I noticed that the front shackles are shorter than the rear. Any reason to not run them in the rear? I prefer to avoid the block in the rear if I can. Just offensive to my sensibilities.