I believe the car is described as Meteor Gray Metallic which is a dark gray metallic. Should look a lot like Slate Gray Metallic.
Here is a link to a site that has some side by side photo comparisons for exterior colors:
http://www.europeanspeed.com/excolors.htm
Not sure what the factory options were in 1985 but would want to see if it has been resprayed and if original how well it has been cared for.
If this car were a little closer to me, I'd be there today taking it for a test drive.