Another leaf spring question/problem

So now come to find out the leaf springs on my 65 Cuda are 2 inches longer than they supposed to be. They are 21X 36 and springs and things says they should not be that long. Looks original but who knows. Replacement does not work may just get them re worked. Anyone ever hear of a different size leaf spring on 65? its a stock cuda slant six should be the same as all of them.