The casting date on the block is 00 00 68, if so what are the numbers in the spot in my example for the 00s. I have seen 1968 cast blocks that were put into original 1971 Hemi Cars. The assembly date of the motor on the bottom of the oil pan rail tells you a date when it could been put into a Hemi Body. If this date example 2 2 68 like Dan has in his post then it can only go into vehicle from the factory that was buil after this date and in a 68-9-70-71 built after Feb. 2, 1968. Some times on the assembly date on the oil pan rail there is a letter referring to the year of car the block was put in.