J305
The DT3E breaks down into a 1973 Truck engine with reinforced webs. The only thing I could find in what I have here for the D2TEAA head number says it is a crank for a heavy duty truck. I don'thave the list of links to go to to look up these numbers here but I am sure some of the other guys can post them. If not I will look them up when I get back to my books. Sorry I can't tell you more but what I have here is limited.
Edit:
I just found two links that may help you.
www.classicmustang.com/decoding_part_numbers.htm
http://pliverman.home.mindspring.com.
Ron