It appears the AAQA is nothing more than a foundry stamp according to Chrysler Historical Services.
Here is a response to an email I sent with an inquiry.
Hello Bruce,
I spoke with our restoration experts. These figures are called foundry numbers. They do not have any significances or meaning behind them. I am very sorry I could not help you further. If you have any questions, please let me know
Danielle Szostak-Viers
Chrysler Historical Services
CIMS 410-11-21
12501 Chrysler Freeway
Detroit, MI 48288