I have not seen the side of the block since the 1986 rebuild. I did read in the compiled Mopar racing bulletins that the AAR designation was only on the cuda trans am racing blocks.
This one had been in a gold 1972 Duster a guy ran at US 30, but his wife got sick of it after he put in too much cam.
I haf no idea what that meant when I bought the motor in 1982.
Trans was from my friend's 1971 Fury III w 360.