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

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Jason I am now not 100% sure if the rear is a "BE" anymore. I had the owner look at it again and he thinks it reads out "PF" which makes more sense but the rear gears are much lower than 3:31. The light in his garage is very dim and I will not know for sure till I get the car on a lift and get some real light so I can read the code with my old eyes. We are $500.00 apart on the price. I am going to Long Beach this week end and if I do not find anything I will pull the trigger.
Mark Sheppard