110F 000 means that either the engine belonged to a Fiat Nuova F made 1965 - 1972 or a Fiat L from 1968 - 1972. Now the 3031268 number indicates, like what was stated before, you have a motor made in 1972; motor serial number range - 1972 from n° 2993913 to n° 3096091. The motor: 110F.000 originally was 499,5 cc and 18 hp. If you look under the hood up front, below the name plate there should be a number stamped into the sheet metal. It should be 110F 000 (if not motor type does not match), but unfortunately it will not tell you if it is the original motor. Only historical paperwork (libretto circolare) would be able to match motor to car. Hope this helps.