Rear tires are rubbing on fender!
It's common to see 1/4-1/2" of difference in clearance from one side to another, not hard to understand as that's only a shift of 1/8-1/4" towards one side from centered.
1" is a lot, I'd try loosening the front spring hangars and shackle mount bolts, then see if they'll shift over towards the driver's side, then snug 'em down & recheck. The accuracy and snugness of those blocks may the issue if they're sub-par or incorrect. You can get new U-bolts(Well, You're supposed to, but if You're keeping the blocks & didn't over-torque them..) and check the spring eye bolt and corresponding holes in the perches, they should be a snug fit, if not there may be a little "wiggle"
room to shift it further there. If they are snug, You can slot the perch or seat hole laterally a small amount opposite the direction You wish to move the axle. To center
up say 1" of room on the drivers side and 1/2" on the pass. side, You only need to shift the axle 1/4" to the dr. side to center-up.
