There is a local shop here that charges $320 for a pop up sun roof install. They garantee their work and will replace anything that leaks. When I had my '87 they tinted my windows and I was going to get a sunroof but I ended up selling the car.
I also have the same one you have, Danny. It has the sliding headliner with vent. Mine leaks just a tad, though. I have a guy redoing my whole headliner, so I'll see if I can get him to fix it while he's there.....
I did not read all the post, but my 92 coupe has a aftermarket sun roof, and it nly leaked once in the rain in a heavy heavy heavy down poor. and it was actually just a little drop.