Looking into upgrading rear suspension

when I moved my springs in on my 67 Cuda I used B body springs, the car sat a little higher than stock, but not as high as S/S springs.
the B body spring has an extra leaf on the right to preload the rear end.

I would send some pictures, but I'm having trouble sending pictures from work
anyway the car sits approx. 27 1/2" of the ground in the back I plan on