9163 Chevelle coupes,convertibles & elcaminos were equipped with the iron headed L-78 engine block during 1969 production.That's as close as anyone,including Chevrolet or Fisher Body can tell you today.
You can post photos of it on here as well.
Canada never assembled any L-78's,but if it was exported to you via Canada,check with George Zapora to help document it's authenticity..
http://www.vintagevehicleservices.com/imp-exp.html