318 race engine 4104230-318 any info. on these engines?

several weeks ago...someone had a 318 race motor for sale in craigslist and he had those same casting numbers...i called him up and he live only a couple of miles away..went over and looked at it...and it was a 318...did not have X cast in front of motor..I told him it would also have 4 bolt mains...

he said he would drop and the pan and call me if it had 4 bolt mains...i never got the call....