Many moon ago I got a set of half leafs from J.C. Whitney Co. and Installed the, on top the rearward end of the leafs. These were meant to be adjustable so the (4) U bolts were extremely long and everything was to be double nutted. Instead I drwaed them all the way down tight with one nut per, burned off the excess threaded ends , then mushroomed the end with a shop hammer while cherry red. Nothing was gonna come loose, be seen, or bite me on the head in the future. Rear heigth went up almost 3 inches. A little higher than OEM. Re adjusted the front ride heigth at torsion bars, realigned front end. All good from there. Drove that car 9 years , forgot all about the 1/2 leafs being under there. Only one person ever mentioned noticing them.
If I didn't have a good set of stock 6 leaf springs here to put under my red car I'd do the same 1/2 leaf install again.