I have a block with mentioned numbers above. Block casting is 3892657. I did not do a typo, the L is before the 7. The engine code appears to have either been tampered with or errors, to look like an MO. It was suggested by code possibly a 350 SS motor from 67. Found the block in my deceased father in laws garage with a bunch of other blocks trannies heads etc...message me if the owner of the partial vin needs to evaluate it. Can email pic of stamps.