I recently just purchased a 1991 5.0 LX Convertible and could not be happier. I paid $2,700 and the car has 132,000 origional miles. The interior was dirty, but I carpet cleaned it and it came out almost brand new. The paint was oxidized so bad I thought I was going to have to repaint it, but it wasnt anything good old meguiars was couldn't take care of.
Be sure to click my link below in my signature and check out my car. The pics were taken a day after i bought the car and I have since fixed the missing horn button. I will get more of it all cleaned up when I can borrow a digital camera.
If I was you I would look on
http://www.autotrader.com or in your local newspaper classified's, which is where I found mine. Good luck with your search, and be patient. It took me 6 months to find a car I could afford. Post pics when you get it if you can.