After looking at some of these, I see they sell for between $1,000 to $2,000 dollars. Some have a "date stamp" underneath that would add value and of course, if the name on the side was legible, it would also add value to your block. I have also seen some (online) that have wheels. It looks terrible!
If you are persistent on making it mobile, and have reasonably level floors, (wouldn't want that thing rolling at me on a slow morning! LOL!) I would go with the "cart" idea others have suggested. But, I would trim the sides of the cart / dolly with boards that cover the wheels and extend up about 3/4" on all sides to create a storage tray under the block. Then I would beat the crap out of them to make them look antique with a stain to match the legs.
Great looking piece!