You sound like me. I have had my 85 GT for 22 years and have only put 83,XXX on it. I put a whopping 200 miles on it this last summer. Gave it a paint job about 4 years ago and it's now up for sale. Can't stand to see it sit any longer.
I had an 85 GT once, and an 85 GT is where my Mustang history begins. I had an 85 Subaru and my friend had an 86 4 cylinder Mustang. He got tired of the meek 4 cylinder Mustang getting beat by my Subaru so he bought an 85 GT. I'll never forget my first ride in that car......my buddy gunned it and it went all shades of sideways. I looked at him and said "I'm getting one of these". This was in February and I bought an 85 GT in April. That was a fun little car but I hated the carburetor. After another friend of ours got an 88 and a few months later I got my 89.
Useless info, but my 85 will always have a special place in my heart. Sorry to hear you are selling yours. I have contemplated selling mine on an occasion or two. My Wife and my Dad have talked me out of it. My Dad bought a 69 Camaro brand new, and he sold when I was born.....he has kicked himself in the butt for years over selling that thing. I guess I'm using that as an example.