I dont know how bad your's are, but some of mine were literally missing in the rear of the car. Over large bumps the body would actually bang against the frame.
I replaced them with the poly bushings and what a difference. Car is super tight now. Maybe too tight, I would go with stock rubber if I had to do it again. Install is a bitch, broke a few of the nuts from the body removing the bolts, had to tear up the floor, reweld new nuts in, then put the floor back in. If the car doesnt have much rust/low miles you should be ok. If nothing breaks on you, its not a bad job at all. Use an impact to get the bolts out if you can, less chance of breaking stuff.