BJ-- I'm in the process of putting the body of a 51 Plymouth sedan on a 90 Dakota frame and drivetrain. Just at the very beginning, really. The Dakota longbed frame is about 3" too long, although track and width look fine. Also, there doesn't seem to be a lot of room in the engine compartment, so I'm keeping the V-6. I'll keep you posted, but would also be interested in what other folks have experienced. The Dakota swap was by far the least expensive way to get modern brakes and steering for the car.