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O.K. Here's the Skinny,
The #'s are indeed "471594",cast just above the GM logo on the rear drivers side of the block,(if you were standing in front of a hood looking down the motor).
There is also a "F 30 80" Cast into the center of the block,& a "T3" cast on the passenger side.
There is a "81 CX" cast on the center of the transmission.
(with the 81 underlined)
There is no 4.3 Cast on the block,(anywhere that I can see) or any other Liter designation of any kind.
Thats,That!
P.S. The distributor is "Center Rear".
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