47-55.1 Leveling Rear Frame

[Driver_WT]

My 53 Chevy Truck is on a 1993 S10 frame. At the rear of the frame, the right side is 1/2" higher above the floor than the left side. And one of the rear shackles is angled toward the rear a bit more than the other. Can I just put on a longer rear shackle on the low side and if I make that rear shackle 1/2" longer will that raise the frame 1/2" or do I need to make it 1" longer to raise the frame by 1/2"?

Any other solutions?

Two new leaf springs are about $600 so I am not really up for that.

Thanks.

Wade