Stop in for a cup of coffee

I have a question with power steering; Although I am at work right now and for some reason am not able to post this as a thread. Any input is greatly appreciated. And Merry Christmas to all.
Power Steering:
My buddy has a '71 Duster for which his power steering is much to easy and make his car feel like he is driving on ice. His tendancy is to overcorrect on corners and turns because he doesn't feel the road very well. There is no or not much resistance in steering the car; As if the pump is putting out too much pressure. What is the fix? or is there one? He bought a new pump for his car. Could they have provided one that belongs to a heavier model rather than his Duster or is there a way to adjust the pressure, if that is even the issue? Thank you in advance for all replies. I'll be checking the forum for your input from time to time.