Bob
Click here,then scroll to the 4th one from the bottom and bring floss....It's item #53217423.
http://www.gmphotostore.com/Chevrole...products/1309/
This pic has been discussed before.
It looks like a 6 cyl,as well as a tool box or a gas can sitting in there.No one can really say for sure.
That was typical of a few Chevrolet photos back then,as they took ordinary base models and trimmed them out to look like their upgraded breathern.
I guess they had to make do with what they had available at that time.
The 1970 SS Chevelle showing on the front cover of the Salesmans leaflet brochure is actually a Malibu with waterslide decal SS hood stripes and various airbrushed Super Sport trim added later on.