It should interchange no prob from any 81-88 Gbody, the 78-80 generally had a different moonroof, but I'd bet the motor would be the same. 80's olds toranods & Buick Rivera's also used the same moonroof. Better grab the motor while you can, gbodys with a moonroof are pretty rare. I know where a 81/83 regal is with a moonroof is if you need any parts in the future, although I couldn't be for certain that all is good.