f150 spring swap after TG 3 inch sas (1 Viewer)

[yotayes88]

Got thee sas done about 2 weeks ago. went with the 3 inch trail gear sas kit up front with marlin crawler bearings in the axle. also went with 529 gearing. now I'm going to be putting f150 springs in the rear to get get rid of the lift blocks. my question is how do i stall the springs so i can keep the shackles in the stock locations? I'm planning on builing 6 inch shackles. also what would i do about the pinion angle. i already have the ford springs . tthey are out of a 1987 f150 two wheel drive .