darkgrace

My boss just bought this car and brought it into our body shop. So I have to do all the research on it. Love these cars we have now had two in the shop. Boss used to rebuild z and 510's 20 years ago. Any way is there any way for me to figure out if the motor in our car is original. I looked all over the motor but cannot seem to find amy numbers. Is there a tag on the motor that i am not seeing? Thanks for any help you can give me.