Keep in mind that the Canadian GT's had standard radio. No sub-woofer to mess with.
Not a terribly "tough" job. Be careful with the center console. As the FRRP short throw assembly replaces the standard unit, no cable adjustments needed. Go with the metal shift bushings over the nylon ones.I would expect it would be less than an hour total time.
One of the best changes one can do to make the GT even easier to drive.