I have an 86 K5 and I want to do a shackle flip from diy4x. My plan is to shackle flip the rear and do the B52s up front. I have the 52" springs for up front and 56" for the rear. My concern is that I don't want much more than a 4" lift over stock height. I want to know what size shackles I will need to buy to accomplish this. Thanks for your help.