Hi... I am new Mopar member.. Need help!!

Have a 70 Cuda, and in the process of putting a 440 -6pack!
Found one for sale, Stock rebuilt... with a 6-pack set up ,
Its Carbs to oil pan complete, and heard running!
I am concerned about the YEAR of this engine???
Its is a 1973 Block!

I am not hat knowledgeble on engine 440-blocks..
And which are better year production??

Hope some one has experience and knowledge..
for the big Mopar Blocks to help me!

Thank you so much, Sonny