Mine required NO MODIFICATIONS. It dropped in with all other stock parts. When I first drove the car, I thought something was wrong with the power steering because of the increased effort. At first, I thought it didn't feel right for a '69. After about 15 minutes I never looked back. It just feels better. I've still got my original steering box, but I don't really miss the nice Saginaw "S" or the casting numbers, so I'll keep it on the shelf. Maybe, I'll hang it on the wall in the Firebird Garage, Museum, and Hall of Fame. Naw.