trying to find year of 305 motor

I have the numbers from the head of my 305 motor. What do I need to do in order to find out the year of the motor by using the numbers from the head?

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you need to go to http://www.mortec.com/ this site will teach you all you could ever want to know about chevy casting numbers where to find them and what they mean
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you need to go to http://www.mortec.com/ this site will tell you all you will ever need to know about chevy casting numbers it is a great source for id on chevy heads and blocks
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