Now days you can get all different front spring sizes that will lower the car an inch or two from stock or raise it from stock to 1-2 inches higher. This is also true for the rear leaf springs. You can also buy the coil over spring/shocks to set your front height where you want it. You should also be careful in asking what others have as far as height from ground to fender lip because tire size will also changes those measurements, so make sure to ask what tire size they are running to gauge it accuratly. I do not believe that your springs will outlast the car. I had the same problem as you with the front and rear bobbing up and down and and how the car handled going around corners and how the car sagged. New springs will make a big difference if yours have never been replaced. I put some stock size leaf springs from Eaton on the rear and put in some stock size front springs from eaton and I am sitting about an 1 1/2 inch higer then I want to sit in the rear so I am going to replace the rear with a set of global west L-2 leaf springs that are suppose to drop the back 1 1/4 inch which should be perfect and I am sitting about an inch to 1 1/2 -2 inchs too high in the front so I am going to replace the front springs with some coil over spring/shocks so I can set the height where I want it to be.
I am running 17X8 inch wheel with 4.5 back spacing in front with 245/45-17 tires and 17X9 wheel with 5 back spacing with 275/40-17 tires in the rear. I havent measured my ground to wheel lip yet, but I will if you want me too.