How to tell what a 360 originally came from ?

Hello everyone :hello2: I have a new member asking me how to figure out something and is new here :happy1:
He has a 1973 dart swinger and a motor that he know's is not an original.
It was a 318 car but he got a 360 with it :-k
His question to me by pm is how does he go about figuring out all the details on the motor and what it came out of :-k He has the casting numbers and all :cheers:
He said my help would be much appreciated.
I would like to answer this question for this new member with zero post's
Is there a tread here some one can pull up and send to him by pm ?
Or can a good tec jump in here and help :happy1:
I get this often and I some times can quickly answer some of them, but Can a member send me in the right direction :happy1:

Thank you all for your time :happy1: