The original column shifter cars are indeed getting more scarce as the years go by, there is no question about that.
At some point those original cars will be sought after and desired for that column shift "option". If I had one I'd be very careful how I modified it, and keep ALL parts and pieces.
Just my 2 bits.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?