Leaf spring dilemma !

[54Caddy]

did that wont work. for some rear the one that is marked 70 4x4 chevy has a higher arch in it making the problem. Like said at one time before the truck was in my family 20 years ago someone replaced that leaf with those yellow junk yard markings. Handled the problem my new leafs should be here this week. went ahead and order some brand new ones. 250 shipped, oh well rather have it rite then a block on one side to make up for difference. Plus now no spring sag to take into consideration and all suspension will be new front and back.