best rear shock for adding 1" of height???

well, I didn't want to go the spring shackle route, although I've done it many times in the past. I don't want to change the leafs. Trying to stay away from air shocks. I think some use adjustables - like a coil over shock - that can add some height. I want 1" on the rear of one of my Dusters.
Be careful with the overloads. The springs can come too close to the lip of the gas tank. Early A's are real bad for that.