These new TKO-500/TKO-600s have a shifter location that works GREAT with your stock console. No need to move it anymore! The 16.75” shifter location that comes with the trans is all you need.
It is true that the shifter is centered in the tunnel, whereas your stock shifter was offset a bit to the left. However, that is not a problem, and the TKO shifter location works just fine.
Tunnel modification; You will not have to do anything significant to the tunnel, however, you will have to trim the existing shifter opening a bit as shown in these pics (forthcoming).
Mike Forte has designed a custom shifter just for the 67-9 F-body cars. It puts the shifter bar right where the Muncie shifter bar is. See more about this shifter here.
It is a bit smaller in size compared to the Hurst billet alum shifter that comes on the TKO line now, which means you will have to trim less from the stock shifter opening in the tunnel.
The TKO has a C6 output shaft that will require a C6 slip yoke to be installed onto your driveshaft, and the driveshaft will need to be shortened by about 2”.