That particular bike would have probably used a belt driven comet torque convertor. See the large tab thats welded to the frame that sticks up, also there should be 2 small holes on the rear frame upright on the same side. those are there to hold the large belt guard on. The jackshaft assy is correct with the exception that it has a sprocket where the driven would have gone.
pic of one:
This bikes now totally dissasembled and most of its parts are on its way all over the US right now, but it was proably the same model as yours: