I think you have most of the basics covered. Check for rust in the front floors, and the spare tire well. Being an '87 Shelby Z, it should be intercooled and have an A555 transmission (round tag on top of transmission will give you this info) as well as a two-piece intake manifold (do a quick google search for 2 piece intake pics..I'm at work or else I'd post a reference for you). How are the t-top seals? They're prone to leaking.