Hey 429,
It sounds like the interior should be lookin' good soon. You should get some pics of it when you're finished. You might do what I did, and get some late model seats. I have a set of grey seats from a '98 in mine, and they are soooo comfortable. I got 'em from a junkyard for only $85 (both), and they bolted right in. Only needed a couple of washers. The bolt pattern for mustang seats didn't change from '79-'04, as these are all Fox platform 'stangs in one form or another. I was even able to splice into my wire for the power lumbar support and make use of the power driver seat from the '98
. Imagine if you could get a hold of some '99-up seats with the little embriodered ponies on them!
Dark 5.0 may have a good point. It is unusual for a Fox car as new as '90 to have so little in the way of options, even a 2.3L. Your speedo is kind of a givaway. The '90 model cars would have an 85mph one for the 2.3L, a 140 for the V8, and a 160 for the police cars, with a little "certified calibration" label at the bottom by the odometer. Check yours out, and let us know. Did you figure out your gear ratio yet?
Jeff