Just bought an all original 1969 Dodge Dart swinger 340

dw340 2268 0345. 2268 is the 10000 day calendar date that shows when the engine was built. Day 2268 is Friday, October 13, 1967. looks like a 68 engine. Also, on the oil pan rail will be a machined pad with a partial vin, ex 8B123456 where 8 is the model year, B is the vehicle plant, and the 6 digit is the last of of the vin