Still using that stock column, but you have upgraded to a late model transmission. This indicator is the answer for you. Fits back into your stock housing without any modifications.
Vehicle Fitment
1968 Chevelle with Turbo 350
1968 Malibu with Turbo 350
1968 El Camino with Turbo 350
1968 Chevelle with Turbo 400
1968 Malibu with Turbo 400
1968 El Camino with Turbo 400