I thought Huck Finn was across the street from the Heritage Diner on River Street. Might have eventually become a Roy Rogers? I Google mapped where I thought it was and it looks like the building still exists. Looks like it might have been converted to a bank at one time and now is available. The building is shaped as I recall, you enter in the center of the building and then there was a dining area on each side. Each end of the building was canter levered forward. I believe Shea Chevrolet was on the next block down, on the street behind it.