If it was put on your car at the factory and has a

[novadude]

Mark C. said what I was thinking. Engines came to the assembly plants ready to drop in the car. Also, it's not like GM locomotive parts would have been floating around Norwood. Nothing is impossible, but it seems like a strange story.

Similarly, I am always skeptical of stories of 427s going into 396 cars. Any 427s shipped to the assembly plants would have already been allocated to certain jobs. It's not like the had extra engines laying around like bolts in a hardware bin.

Nothing is impossible, but a lot of these stories don't make sense based on the way manufacturing plants are run.