My knowledge is that only the 4 speed "F" bodies got the non 557 blocks. I have the original 400 out of my buddies Catalina, that he special ordered, with the tow package. It has the "real" balancer and the 557 block....
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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