The 'Y' code wouldn't be for a 'YC' engine. Just for a 455.
Now some 455's only had automatics like the 455 Judges in 1970. (but 70 didn't have the engine code in VIN)
Technically the 455's could have either manual trans or automatics.
In 72, the 'X' would be for 455HO not plain jane 455.
Now if it was a Bonneville, a 455 may have been only automatic, would have to check references though.
Still think the company submitted the VIN somewhere and they got a list of options etc the car came with, like PHS.
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John Wallace - johnta1
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