Pistol Grip handle mounting?

I need to clarify my question, I meant the Hurst shifter assembly itself in my 69' Barracuda only accepting a slip in shift handle. The B-Body pistol grips I've seen are all bolt in and I believe my 69' Barracuda has the hurst shifter with the slip in shift handle. Do I just drill the two holes in my shifter assembly to accommodate the shift handles two bolt holes?