Ok, I searched the previous threads for this, but the number I have doesn't make since.
The Stamping on the top pad shows :
E 440
9-20
Which makes since with regards to the build date of my Challenger, but stampings on the left pad reads:
CP45K9C124775
I thought is was supposed to just be the VIN, so I would expect 0B177595 I bought the car in 78 and would have thought is was the original engine but ...