The 105 range had 1300, 1600, 1750 and 2000 engines all of the same configuration so you have got a 1750 engine from a Spider, GT or Berlina.
My avatar is of my 1750 GT Veloce from 1968. The 1750 engine was available from 1967 to about 1972 and it is many people's favourite as it has almost the oomph of the 2000 and almost the rev happiness of the 1300.
