8 3/4 center chunk ?

To the best of my knowledge, there is no casting dates on 8 3/4 centers.
Different years for "741", "742" and "849", but no specific dates, that I'm aware of.

http://www.mymopar.com/Mopar8_75RearEndGuide.htm,

http://www.mopar1.us/875.html,

Hope this helps.
Giles