Power steering problem .

I have a 66 Barracuda with a 273 that is up on jack stands when you start the car the wheels start turning slowly to the left every time. If you hold on to the steering wheel it doesn't fight you and you can turn it back without any resistance. Is this a pump problem I have turned wheels back and forth to eliminate air in system . Is there a adjustment somewhere I would hate to turn this thing into a dirt track car . Lol . Hope someone has an answer