PHOTOS!! MUST HAVE!!! LOLOL
I love the look of those old girls. Actually if there is nothing wrong with the gearbox per se, no reasons you cannot put a floor shifter in. Can you do welding, fab work? There should be "lots" of room down there to do so
Sorry, don't know about 833. On the A bodies, at least some 3 speeds are different bolt pattern, and the center hole maybe too big or too small