Your car was a factory console shift, but you have upgraded to a late model transmission. This indicator is the answer for you. Fits back into your console without any modifications.
Vehicle Fitment
1966-67 Chevelle 2004R with Console
1966-67 Malibu 2004R with Console
1966-67 El Camino 2004R with Console
1966-67 Chevelle 700R4 with Console
1966-67 Malibu 700R4 with Console
1966-67 El Camino 700R4 with Console
1966-67 Chevelle 4L60 with Console
1966-67 Malibu 4L60 with Console
1966-67 El Camino 4L60 with Console