What specific items should I look for? - 1968 GT500

Hi,
First time member on this forum. Am an avid Mustanger for years (67 GT S-conv, 68.5 CJ fstb currently) and I have an opportunity to view a 68 GT500 for possible purchase.
I know very little about the vehicle. Caught only a glimpse of it once. Engine, fenders, hood, interior were out of car. It appeared dark green w/tan. Saw the roll bar. O reports all the parts are in his basement. I'd like just a little advice on what hard-to-find parts I should check for specifically. I plan to run the VIN through Marti to verify and assess options. The vehicle has been in this garage for 20 years, o has had plans to restore, but local economy isn't helping him. It is not a definite available car quite yet. In other words, there is no "for sale" sign on it, but the owner called and is getting closer to a decidion to let it go.
I think I can manage to assess the shape of the vehicle from a rust perspective, and assess most of the "Mustang"
components, but I am very unknowledgable when it comes
to Shelby stuff. (other than I've drooled over them since I was 16)
If the parts are in the basement in a pile, I am a little worried about what to make sure is there. In my mind I am thinking things like the console, guages, shoulder-strap retractors, shifter, steering wheel, door panels (?), tachometer cluster. Most of the other things that come to mind for me are standard Mustang items, and shouldn't be hard to replace if they are missing.
My concern is that during my evaluation I get all excited, make a dumb decision, then later find out the car is missing 20 thousand dollars worth of hard to replace Shelby specific parts.
The original engine is long gone. It seems like it's going to be difficult enough to try and find the correct dated engine and all it's components anyway. I am not sure about transmission or rear axle. (is it supposed to be 31 spline nodular case like a CJ?) Is there anything specific to a Shelby transmission? R-servo?
Hope this makes sense. If I have the opportunity to view the car, I am sure I will have more questions before I consider going any further. I jus need a little more knowledge before I drive there.
Thanks for your help.
Eric.

 

Re: What specific items should I look for?

Duh, I just answered some of my questions from seeing the Coralsnake website. So, no need to answer trans, axle, questions. Also found I need to add fog lights to my list. Anything else come to mind?

 

Thanks everyone. Might you recommend someone in the Detroit area who is knowledgable and helpful?
Eric

 

I now have the Shelby number: 1576. Who can I contact to find further information from this?
A Marti report has been ordered. What I know so far is it is dark green/black, auto.