steering gearbox bolts broken how much to fix on 1995 Cadillac DeVille

i went to a shop because my car would not start he fix that but said my steering gearbox bolts not all but some where broken and need to be replace soon his cost was 350.00 dollors seames hige

Asked by for the 1995 Cadillac DeVille
nope, sounds right. he has to remove the rack and pinion to service this