why wouldn't you get the Magnum far better than the LA even with the roller cam with the option to use several of the LA stuff on it. I lived in era of the 70's and 80's car companies trying to take existing products to meet certain demands which never was any good. The 89 is old school with a roller cam the Magnum was a new design motor. Even in stock form once you have a Magnum you'll never go back IMO