Engine Decoding HELP!!!

10-13-66 means the block was cast on Oct. 13, 1966. It should have been assembled in March of '67. The 273-2 means the displacement of the engine was 273 cubic inches. The 2 was the version of the casting cores used. For the first couple of years of production the 318s used the same casting number as the 273 but used different casting cores i.e. 318-3 instead of 273-2. Chrysler didn't start stamping VINs on engines and transmissions until 1968, so prior to then there was no such thing as "numbers matching". The model year started out with sequence number 1. The higher the sequence number, the later in the model year it was made.