QT1227 is from a HQ GTS coupe built pretty early in HQ (it is the 227th number in the HQ engine series).
2nd is HZ mid '78, anything but Deville or Caprice.
3rd is HQ early 1973 anything but Statesman, Deville or Tonner.
Last is from a later 1979 HZ Deville or Caprice.