Probably a lot (to most?) of the 6 cyl Camaros have been converted to V8's over the intervening 45 or so years... by itself, it's nothing to worry about (although NOT original), but I'd also want to know what else he changed to the V8 item (springs?, trans?, rear end?, etc). The trim tag shows you how it was built originally, but after 45 years one has to play detective to see what has been changed, and how well it was done...