Carlos Fernandez’s 1969 Mustang is almost more modern Mustang then vintage. Carlos took a 2005 Saleen Mustang chassis and grafted it under the 1969 Mustang Fastback body. The Ford supercharged 4.6L V8 along with just about every other component from the modern Mustang was used, including the interior. Another advantage when doing a complete drivetrain swap is the cornucopia of aftermarket parts available.
Source: Hot Rod blog