Ride height change when adding a leaf spring?

[Nuckingfuts]

Our 73' shortbox currently has a DJM suspension kit that includes 3" drop spindles, 2" drop coil springs up front, flip kit in rear (including shock extenders), and new twin tube shocks all around. The overall truck ride height is about 3/4" lower in the rear, resulting in a stance that looks slightly 'sagging' in the rear. I'd like to level the truck out by raising the rear with either a) lifting shackles which give about 1" rise or b) adding a leaf spring to the pack. I'm leaning towards adding a leaf to both stiffen up the rear and hopefully raise the ride height, only problem is I'm not sure how much static ride height I would gain from it.

Any input or thoughts on this one?