340 engine block w/no serial numbers

Yes I was told that this was # matching car. The trans. matches the vin.
but nothing about the vin is located on the block. I did see some other numbers on the right side of the block ,date numbers you say. I saw a number of a date that ended with 70. possibly the year, can't read the month or day. I'm hope it's not a 70 year block with 73 heads.

thanks