Since the neck was knocked loose in the fall and needs to be reset, and since the top had to come off anyway, and moreover, I still have all the templates and clamping blocks I made for the instrument in the first place, I decided to remove and replace the top block, too, rather than shim the existing one before resetting the neck.
This presented an interesting challenge: the original label was glued to the top block. Preserve it? Sacrifice it?