340 Block - 1970

Carjunky said
1970 cast can be for 1970 or 71 car. If folks really want to know look at the stamped assembly date on the top front driver side of block and the first 4 digits of the last 8 will give you the Mopar 10,000 day for month and day of assembly.

That stamping also verifies that it is a 1970 model block as it starts with an "F." A 1971 model block would start with a "G." The full stamping is FW340P32680569. "3268" translates to a July 9, 1970 build date.