10 pounds is a good sized bass. I grew up in Michigan...the largemouths there get pretty **** big and 10 pounds would do anyone proud out there.
The head isn't *just* for presentation, however. If you're going to pack it in a salt dome, the head does actually serve some sort of a purpose during the cooking process, though I'm not entirely sure what that is.
However, if you're cooking a bass in a salt dome, you're doing it a huge disservice, so it probably doesn't matter.