Yeah... MAYBE... is the operative term. No one has seen her bottom hull in 40 years.
My wife and I got to play the starring roles in that PT boat show at Disney during our honeymoon in 2003. We got everyone to laugh when my wife got drenched by one of the exploding depth charges and I decided to use my mop to dry her off.
You're probably right about not having a pool of water if the boat is on blocks. Another idea that I had was to deliberately pump river water into the basin to keep her afloat (and to drown the moles and gophers) and then every year drain the basin to do maintenance. The floating boat idea would go well with the dock idea that Rick has.