I have the Eibach convert springs and then added Tokiko HP shocks / Struts. When I first put the springs in only it lowered it almost 2†and I did have quite a bit of issues with the front end convert brace below the K member scraping and catching any bumps, road kill, or dirt clods (really fun.. not).
About a month later I went back in and put the poly spring isolators and the Tokikos it brought the car back up a ½†and now I never have any issues with 2 adults in the front and 2 kids in the back.
Sounds like your stock rear springs and shocks are gone, my stockers were pretty trashed out with 130K on them living and driving on rural roads most of its life.
If you do get springs make sure to get the convert set, the coupe sets are the wrong rates and will make your car have major issues with bottoming out and don’t forget the rear pinion stop replacement that should cone with your springs.
If you put in the springs without new shocks / struts rated for performance springs, take it from me, it will ride really rough and when you do hit a bump or hole at enough speed it will hurt and may even cause some real damage.