I think its a Chevy SS.That’s what it looks like to me.
The Grill Medallion even looks like an “s”.
The “SS” designation usually meant that the car came with a big block engine, typically a 396 but a few came with 454s and for the very fortunate, even aluminum block ZL-1s by special order. Many different models could be ordered as Super Sports. Miss my 427 ‘68 Camaro.