The 1968 Z/28 Engine Compartment picture came from the September/October 1996 Camaro Enthusiast.
for page 36
"ENGINE COMPARTMENT DETAILING '67 - '69
Many Camaro engine compartments are the same after '69 as far as what is
painted what. Most '70 - '74 were identical with few exceptions. However this
article is dedicated to the 1st Generation Owners. The photo is a 1968 Z28
engine compartment from Chevrolet. We reproduced the photo full size so you
may see the details, and then put the arrows with numbers on the same picture."
The article is pages 36-39. The previous picture is page 36. Here's pages 37 - 39.