The man who built my Challenger installed one back in the early '80s.
The ratios are good for road course fun. I've only used it with a 360. I've had the car for 20 years and haven't broken anything in the trans. Went thru it and replaced bearings and seals when I first got the car. All those parts were the same as corvette stuff and easy to find. Bear in mind this is a T-10, NOT the super T-10 which came along much later and has a very good reputation for strength.
Mine occasionally sticks in two gears while moving around the paddock, other than that, no problems. I think Chrysler may have only used it behind 361s. though don't quote me on that!