they are a great looking car, 4V refers to the design of the head - the intake port has a greater volume than the 2V. not sure anyone makes a 4 valve head for the 351. came standard with a 4bbl, common set up is to use downdraft carbies like moffat had on the mustang and the falcons for a while. looks truly amazing.
a friend had one, you could just get a coke can sideways under the rear cradle.
de tomaso also made the mangusta, another great looking wedge style.
http://www.motorbase.com/profiles/vehicle/...64;p=1126634563