Evidently John V. is the only one left standing who can cross the Chevy code numbers on these.
I googled everything I can think of and can only find RPO codes such as C60 D55 M40 for Chevy
Code 303 and Code RB both equal 4spd
So it was not a 3spd car
78 XW would be proper block code with a 3K / 3.23 posi
Have requested seller to verify the block casting date and gave instructions.
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