really depends on the condition you find it in. rusty junked prolly looking at 500.00-2000.00 depending on how bad they want to get rid of it. mildly rusty or shows signs of someone who had worked on it your looking at about 3000.00- 5000.00 or in perfect restored condition with all parts being original Zl1 parts your looking at 25000.00-50000.00 really depends on where you are located at, the time of year, how good of a barginar you really are. Good luck finding a Zl1 though rare non the less. I shall praise you with luck in finding one. Check out Nada for quotes as well.
http://www.nadaguides.com 
