Definitely check the floor pans for cracks. I am on my third Fox body and they have all had cracked floor pans that caused problems in the seats. Even if the floor is not cracked install SFC's with the seat braces.
Well I started working on the seat. Mine doesn't have a zipper on the bottom, instead there's two pieces of plastic that slide together. Now all I have to do is figure out those darn hog rings.