How much should I Sell my Zephyr For?

I own a 1979 Mercury Zephyr Z-7. It has a 302 V8, New breaks, hood scoop, Mufflers, Battery, and some other stuff. The paint it in good shape. It also only has 110,000 miles on it. Ive been told these are very rare and want to know where and how much i can get out of it.