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. Buy Chrome Housing #7257 to complete the installation.
Vehicle Fitment
1963-64 Chevy Truck with Turbo 350
1963-64 GMC Truck with Turbo 350
1963-64 Chevy Truck with Turbo 400
1963-64 GMC Truck with Turbo 400