Location of Vin number on 68 340 block
So that # on the side should "match" the last 6 # of the vin?
It's the model year NOT the cast date that determines where the vin is stamped.
If the 2568 is the assembly date, it's a 1969 model year engine. VIN should be stamped just above the oil pan rail, pass side of block about half way back.
So that # on the side should "match" the last 6 # of the vin?