whoa...leaf springs?!?!?!
those are back in the days
for those, you will probably have to get a drop set from a pick up truck. Something from an S10 or simular.
You might have seen those before, they're simple blocks that move your leaf springs upwards into the car...thus result in a lower stance for you ride.
I'm sorry, I don't know which kit will fit your car. You will have to look around.
good luck