I don't believe you can tell an SS on a 70 Nova from the trim tag. 
 
144 is V8 (but does not tell you if it was SBC or BB). 
 
27 = two door 
 
45 paint is green mist. 
 
Car is 52 years old, so things could have been changed.   But, if it was an SS, I believe it would have come with power front disc brakes. 
 
Pretty sure the Nova used a different heater core for BB the way first gen Camaros did; in fact, same heater core and heater box cover. 
That would be a clue.
		 
		
		
		
		
		
		
			
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