Can anyone help decode this motor?
 

We have a 1971 Chevelle tribute with supposedly a 502 crate motor in it. The numbers on the motor are T0623ETB 12J302325. I think it means it came from the Tonawanda, New York factory built June 23 but I can not find out any more. Does any one know where I can find out? I would sure appreciate it. Thank you.

Need the engine casting number...
The partial VIN 12J302325 indicates the engine was installed in a chassis produced in Janesville, WI which based on year of mfg, would either be a full size car or a truck.
This in NOT a crate motor...
Are you sure the EBT letters are not FBT?
That would indicate an '84 454 truck engine.