i have an 88 gt and was looking to lower. i just got a set of 18" wheels and was wondering how low i could go without rubbing the tires and also what you would recommend to lower it with. not trying to get better handling, just a lower stance.
You cannont determine this information over the Internet. I would lower it as much as you want, up to 1.5 inches. And if it rubs in the front, just install Steering Rack limiters.