The easiest thing to do is get a picture of another SS from your year and compare, are there SS badges or hood louvers? If there's a motor, how big is it? if you're not convinced look for a build sheet under the seat covering or on the driver's side of the firewall (under the hood) for a metal tag, the numbers and letter can be decoded using a website, maybe even this one and can tell you the build date, paint and interior colors, model and spec sheet on your nova.