To find out more, have him look for three more sets of numbers. In no particular order;
The casting date will be on the passenger side of the block.
The VIN may be on the bellhousing mounting flange, on a raised pad on the passenger side of the block or none at all depending on the year.
The assembly date of the engine will be on the front of the block right below the driver's side head.
If he can get any or all of those numbers of the block it will definately help determine the date, maybe even the car it came out of.
Best of luck!
Barry