I personally have never bought a car that was not put together. Does the seller have the original tranny, clutch linkage, and all the the engine bay components....engine, turbo, wiring, etc... What year is it and do you have any pictures? I would also suggest to check out this website. SVOCA Mustang SVO Frames
They are all about preserving the SVOs, modifying and getting together. They also have a "Wall of Shame" for people who have perfectly restorable SVOs that they are stripping and selling the parts. This club can't stand these guys. If you want to know anything and everything about these cars contact them.