Convert floor ship to Automatic

Depends how you want to do it. All factory automatic floor shifts were console, does yours have a console?

The stick cars have an "odd" shaped bump added to the floorpan for the shifter. OEM automatic floor shifts don't have that, and the OEM auto shifter comes up through a "punch" in the floor, but requires specific hardware, AND a specific type transmission, which has cast in mounting holes on the bottom of the trans case for a bracket, supporting the bushing/ shaft of the floor shifter

Otherwise "what I'd do" is just make a sheet metal cover for the shifter, and buy your choice of used/ new/ brand aftermarket auto shifter and mount it neatly on the floor