Thank you Gary and Ed for your responses.
This gets even more interesting... I forgot to tell you that the engine has a security wire attached between the upper control arm shaft and the exhaust manifold on the passenger side of the engine. From what I was able to research and please correct me if I am wrong, this 3/8" wire securing the engine to the upper control arm prevents the engine mount to break from the result of excessive torque (i.e. sudden acceleration, engine abuse, etc.). Someone told me this was offered by GM via dealership a few months after the car was introduced to the market (perhaps some sort of recall from the manufacturer) at a cost of $100. I have seen this hardness in only one other 67 Camaro V8.
Is this true? If so, would this be another clue to suggest that indeed, this is the original engine? As always, I welcome your wisdom in this matter.
Thank you ,