I think the best way to tell for sure, is to look on
www.cardomain.com. Look up cutlass cierras, and take a look at the pictures from the same year. Then look at cutlass supremes, of the same year. This will tell you definately what your car is.
But, from the description, I think 85cierraholiday is right, you likely have a Supreme. Nice car too!
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"I know that you believe that you understood what you think I said, but I am not sure you realize that what you heard is not what I meant."
http://www.cardomain.com/id/88delta88