'87 LeSabre power steering noise

1987 LeSabre with 150K, power steering growls constantly, louder when turning, etc. Reservoir full, still only a little harder to steer than normal, but annoying, been doing it for awhile.
1. Is this an clear-cut case of the steering rack needing replaced? 2. How much time, and how difficult, to performing the swap on these vehicles? 3. Is it likely the pump needs replaced -- instead of/ as well as -- the steering rack? 4. What am I looking at cost-wise for parts? TIA

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