How to tell what a 360 originally came from ?

What I did when I got my 340 was it had the last 8 digits of the vin which is probably what the 360 has(I don't know when they stopped putting the vin on the blocks).Anyways I got the year(first digit,then the factory(second digit) went to the internet and looked up what was built that year in that factory.It narrowed it down to two cars.Hope this helps.