the only 428 Cobra Jet powered drag pack 1969 Mustang Grande, and it was being sold in a used car lot when found, completely original

the full story is at http://www.mustangandfords.com/featured-vehicles/mump-0901-1969-mustang-grande-hardtop/  but basically, the owner is a Mustang collector and in 1989 was out looking for a newer Mustang when he checked out this one and saw the Q code in the VIN