Sensitive power steering

My 68 Dart 340 has power steering. The car had around 80K miles. The pump and box were leaking as the car sat in the owners back yard for over a decade, so all new gaskets were put in. No leaks now, but the steering is super sensitive in the straight line. I just think of left or right and the car veers. No fun. Any ideas guys?? The front end is all new.