No, my body style z71 has the shackle hanger upside down compared to older trucks. So if I were to put longer shackles on it, it would lower it because the spring is mounted above the hanger. A shackle flip kit "flips" the hanger so the spring mounts under the hanger therefore a longer shackle will raise it.
ChevyBullDog... shackel flip? Is this just shorter shackels to lower it? I have been making some shorter shackles out of stainless steel for a couple of the low riders around here. It is a little harder to drill than mild steel, but won't rust or wear. If they have a steel yard near "Tigerland" you could make your own to the exact length you want.