Putting Z-28 emblems on a Camaro convertible is not a lot different than putting them on a Camaro coupe.... If they add a strong 302 engine, the suspension, brakes, Munciie etc, at least they will handle and drive like a Z28.. (but of course most don't)... 350 autos with drum brakes also get lots of Z28 emblems... (yes, that's a pet peeve of mine).
Of course, that car *might* have been a true Z28 with the top converted to a convertible, done at the same time the 400 CI/TH400 was installed..... and they jsut didn't wanna go to the trouble of removing those pesky Z28 emblems?? .....