How many miles on each car? The Mustang may have 170 hp but if the engine has 200k on it then its lost some horse power the same with the Tiburon. My guess is they will be fairly close and it will mostly depend on the driver.
If the Mustang is in good working order it should win. It's lighter than the Tib, it has more HP (175 vs. 172), than the tib, and it has a sizable torque advantage. It's also rear wheel drive, so it'll probably get a better launch.