Original engine or not?

Now, look on the front of the motor, right under where the drivers side head meets the block, there will also be numbers there. Assembly date of the motor, displacement, fuel designation, and a couple other numbers. Then, correlate all that with the casting number and casting date of the block. You should be able to say it was cast on.....date, was assembled in ......date, it’s a .....displacement motor for car 123932