My car handles like crap...help me stiffen it up

I had not driven my 89 LX in a few weeks. I took it out last week after driving my 96 GT for the last few weeks. The car handles so poorly it makes me nervous. I have the stock suspension and 245/50/Z16 tires on stock five stars. The car shakes a lot. On the highway both the front and rear end are all over the place when on uneven road. Even on straight roads it wobbles. I have heard that old bushings can cause this. I put the tires here because I have been reading a lot about people having problems with bigger tires. When I take hard lefts I can hear a noise coming from my rear passenger fender well. This has been happening since I got the car. I thought it might be a quad shock but I don't see any sign of it.

I had a four wheel alignment September 2002. That was about a month after I got the car. Did not get them balanced though. I have Pirelli Super Sports. I was going to try putting a set of 225/55/15 tires on turbines I have on the car and see if the rubbing stops and if the car handles a little better. Don't plan on keeping them on, just testing the current tires. Then I will take them off and see if I need new tires.

I have subframe connectors on now, but I don't like them. They are the weld in ones similar to the MM's with the seat brace. I am going to pull them and put in the full length Global West subframes. I am also considering the Motorsport C springs.