71 440 intake numbers

[NorthBound]

I have been trying to play the numbers games in my 71 GTX,it was built may 71.
I found a post in my area.
3512501 intake with a 12x14 would that be appropriate timeline? Built dec 1970 ???

View attachment 1032674

 

[Photon440]

This list http://mymopar.com/index.php?pid=69 shows it as 1971.

 

[NorthBound]

This list http://mymopar.com/index.php?pid=69 shows it as 1971.

Thanks