I recently learned that we ID 1980-89 Buick Estate Wagons as either LeSabre Estate Wagons or Electra Estate Wagons. So will the 1980-89 entries be corrected, or do we leave it simply as Buick Estate Wagon when it can't be narrowed down to either LeSabre/Electra (kind of like how Chevrolet/GMC Suburbans are labeled as "GM Suburban" by default if cannot be positively identified)?

If they can be identified as one or the other name, that has to be done one by one.
For the others indeed I guess we can leave them as just Estate Wagon.