here is the link regarding engine hooks, it has a good link to a 70 Z
with 1100 miles on it.
If you are looking for good original pics even though this is a 70, this is the kind of authentic images that will steer you in the right direction. You will notice that even though it only has 1100 miles all the finishes have a small amount of patina, the engine block is missing a little bit of paint, but all the brackets and bolts are what it left the factory with. They have not been removed re-plated and re-installed and then said to be all original. All original to me says original finish from the factory, not just factory correct.
They are only original once. Think about that, the original paint, plating, finish on the original part speaks volumes to if it is authentic/correct.
I think if you start from original, then the only thing you have to decipher is: are the date codes on your sample car or picture close enough to your own car to use it as a guide for your car.
Again just my 2 cents