SS Engine...
The engine code that is stamped on the deck denotes the size, hp, trans. and application. The base engine for the 70 Nova SS was the 350/300hp small block...you couldn't order that engine in any other Nova, so by default it signifies an SS car. You could also order the 396 in either 350hp or 375hp...both of these were only available in the SS model as well.
So, if your 1970 Nova has any of these 3 engines...with the last six of the VIN on the deck stamp...you have a Nova SS.
wilma