Well, that number is not on my list.
T stands for the Tonawanda plant
0429 means the build date was April 29
HC would be a 1965 327 full size car 275 hp
HR would be a 1965 327 Vette 300 hp
HCR could be something built after 1971 but I can't find it on that list either.
The casting number might help.
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