Opinions on rear spring idea

yes and no...stock in an a-body? umm, maybe in 340 cars, but not in a slant car...and it being a stock car, why would you recommend him XHD's? i dont think he wants a cranked up rearend, just one that sits level
This is a V-8 car with a 318ci ,auto, with factory A/C. I'm not looking for S/S or any other race springs I just want to level the car that is why I'm asking if anybody has done the re-arch idea & will it last. I don't know if an extra leaf will help it to last longer and how much stiffer of a ride ( I don't want it to ride too rough)