Let's not get to hasty on blaming the springs. There's a couple other things that could be going on. That's why it would be great if you were to take a picture.

Again, definitely check to see if you have the same or different wheel widths and/or backspacing. Get under the car and look at the body mounts (hockey puck looking things between the body and subframe up front two rear two middle and two at the radiator core). See if they look worn or original.

If you do talk to the previous owner, in addition to the other questions, be sure to ask if he's replaced the body mounts. And if you have disc brakes now, ask if he upgraded the brakes from drum to disc, or were they always disc.