mopar-mike's 71 duster project

pulled rear seat out and under the seat bottom in between the springs and the burlap looking covering was my build sheet. also while motor and trans were out buddies and i checked numbers on them against fender tag and vin and they are a match. so now i am kind of stuck with what to do....

need some advice here, do i stick to my plan and make it like i want it and just hang on to the stock stuff or do i return it back to stock and restore it all original????