It would be a good deal if it was a factory setup. The front and back carbs look to be hooked up mechanically to the center carb linkage. Hard to be absolutely sure without a closeup. Would have to see the other side to see if the vacuum pots are there and hooked up.
No not really-the vacuum diaphragms are twice the size of the four barrel set up and are very easy to see. They would hang out the other side and are almost as big as the carbs.