What I meant was it wasn't a "Pro" Stock car. MP cars were sportsman level cars.
Leal had been a pro driver for a long time already but was driving a MP car.
To my knowledge, Hemi Dusters were factored out of Pro Stock at that point or somewhere around there and Mopar was moving more towards the Colt. Does not mean they were not involved in all types of racing but MP is/was a sportsman level class.