power steering conversion for '68 cuda

Hi guys. I have a 1968 383 Formula S fastback cuda. Back then there wasn't room in the engine compartment for a 383 and much of anything else. While I can easily live without power brakes or ac, I would like to have power steering in the car. Does anyone know of a way to convert my manual steering to power steering WITHOUT mutilating the car. The car is very original and I don't want to start cutting into it. I can handle a few extra holes for bolts or screws but that's about it. If I convert the car, I want to make sure the conversion would be reversible. Any input would be greatly appreciated.