My car was changed fron black to blue-gray. I didn't remove all the panels, but I took off what was easy to remove. (Lower rear quarters, beltline trim, rocker panels, wheel wells, mirrors and headlight doors.
I dumped all those pieces in the passenger floor, and asked the painter to paint them body color, as well.
The only noticeable issue is the rear clip. It started out as a maroon color. You can still see maroon poking our from places if you know where to look. It's not really obvious, though.
The 2.8 uses a timing chain. Not a belt. It's not an interference engine. I wouldn't change the timing chain until you have to go into the engine for some other reason. I've only ever heard of a small handful failing, as long as I've been messing with Fieros.
I have heard that silicone is good for the rubber weatherstrips.
In case someone makes the suggestion... I don't use Armor All on anything. Never.
Tranny fluid? I'd leave it alone. Didn't you say that all the fluids had been changed before you got the car? (Did I dream that?)
Raising the driver's seat.
I'd be inclined to remove the sliders from the seat, and install spacers between the sliders and the seat. (The sliders are only held on by two bolts on each side. Be sure to use something that won't "fold up" under cornering or other directional loads. Something that's 2" tall should, ideally, be 2" in diameter, as well. I'm thinking something like 2" diameter "pucks" mounted between the seat and the sliders. You will need longer bolts, of course.
[This message has been edited by Raydar (edited 12-24-2013).]