1970 Nova How do you tell if it is a SS?

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I am looking at a 1970 Nova that has a 350, 4-speed, power steering, power disc brakes, black bucket seat interior with no tach or console gauges, no A/C and a 12-bolt posi rear end with low gears. The car has SS emblems but the seller said he added the hood grills on the hood so he did not think it was an original SS. Is there any other way to tell if the car is a real SS? Could you get the 350/300hp motor on a regular Nova? I had plans of dropping a big block in the car or going to a COPO stripper look with a LT-1 350 but I would hate to tear up a real SS car.
Mark Sheppard