No doubt the seller want's big money for this car. It's nice, even if modified.
My 68 RS/SS 350 4spd, is similar in that the engine is pushing 400hp, and I have 17" AR SS wheels on it, but all the rest is stock.
At first glance you should take notice that it has the standard interior but the seats are not correct. The gauges have been changed (maybe for the better, my stock gauges are flakey at best), There are no emblems on the exterior; Camaro, SS, or 396. The car has the window mouldings but no roof drip rail moulding or lower body moulding and fender well moulidings. I thought those all came in a one package? One big item is the missing SS hood. Although the hood on it is nice, it's wrong.
Be careful and check closely. This car may not be a RS/SS. It may be a low end Camaro built to look great which it does.
So ya see it's a matter of taste. The car is nice, just not correct for the pure stock guys.