Who cares what original Z28's had, those cars (and that company, really) are dead. If that logic were true, since SS Camaro was top of the horsepower heap, we should never ever see a Camaro with more hp than a Camaro SS (GT500 be damned!).
As you can see, that logic makes little sense
GM can use any badging they want on any model they want, the 99.999981% of the population interested in a Camaro could care less if the badging "goes up against" the name of some car from the 60s or 70s they prolly never owned. I'd rather not yearn for a heyday by looking backward.
Who's to say GM wont hire out Yenko to do a Boss302 killer on the 2015 Alpha chassis? No one