The "Bowtie" or "Tonawanda" sticker's can be purchased at many aftermarket Camaro dealer's/catalog's.
Rick's Camaro Athen's Georgia has them, but so do many places.
My dilemma with that same decal is IF mine was to have had one at all. I do have the Tonawanda Engine on my 69 307/200.
Mine is the basic no option Camaro. This sticker was on the car when I bought it in the 1980's and along with the car being run down and dirty, the sticker was very faded, original in every appearance as to having been placed on the car when new.
The problem now is, when I'm looking to replace the decal, these place's all say in their catalog's the it was located on the Front of the Left/Driver's side & only on a Big Block.
Mine was located on the Front of the Right/Passenger side of my little Tonawanda 307.
Having trouble locating anywhere that can show decal placement location's on a first generation Camaro.