Some pics I've found online of '69 Yenko Novas show the SS hood, but with the plain non-SS grille and taillight panel..those seem to be two noticeable parts Revell missed....supposedly, 10 were built, but that was 40 years ago, so who knows what is exactly 'correct'..
And a lot of the cars I've seen pics of online are clones...
I like the look of this clone, has a plain hood, bench seat and a plain grille, and the DD/steelies (available in resin from the Modelhaus and others):
Lot more pics of this clone here:
Super Chevy article on Yenko SC Nova clone
The four parts I'd like to see from Revell or the aftermarket to use w/ the '69 Nova kits are the plain hood, bench seat, plain grille, and plain taillight panel...would be useful for a lot of build styles.