360 replacement engine indentification

Thanks for the link. I had found something similar online but that is more comprehensive. My engine is from 74 and made in Toluca. I was originally thinking 76 but what i'm really interested in is their anyway to determine if it was a crate replacement engine? I read they took factory blocks and bored them 20 over etc, and that was from Mopar performance. I'm striking out figuring out if it is a mopar crate engine or just one that somebody had rebuilt.