Are you referring to the rear sitting slightly higher in the rear stock than the front? Are you trying to level the car, not actually cause the front to sit higher than the rear? If so, some will remove the rear spring isolator, and do a heater hose mod, it will cause the car to sit more level front to rear. See the link below with pics, if this is what you're getting at.
https://ls1tech.com/forums/suspensio...d-writeup.html
If you actually want the front to sit higher than the rear, I'm sure there's a website on how to guide you through the Carolina Squat. Likely no one on here can assist with that on an F body though.