A complete setup, 2 carbs and the matching intake sold on ebay recently for something north of $5,000 if I remember right.
It is basically a weber setup, with each barrel of the 4V feeding just one intake tract, so the massive cfm isn't an issue, in fact, in this design, it is probably just right.
Which brings us to the question of street use. Yes, you can use them on the street.
But this is all pretty moot as apparently the whole setup is for sale on ebay:
ebay auction