Hello Yazdi ,
Welcome to chevy chatter, I see that you have a 1918 490 , what a great find!
There is a forum in this chat site dedicated to the 490 model. it is a few rows down from this one. You will find lots of interesting discussion about the 490 model there.
There should also be some casting dates cast on the side of the engine block, that look like - 4-26-18 indicating the month , day and year the engine block was cast.
There is a early chevrolet historian , who can also help with the car serial number and when and where it was manufactured . If you repost in the 490 forum, he frequents there regularly.
Have fun with your 490 , Regards Jack