"Zedder" here on this site has followed the 67Z market for years. His analysis of market values (taken from his website 67z28network.com) is quite accurate in my opinion:
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The Market for 2003: The collector car market in general was extremely strong in 2003 with prices reaching all time highs in many categories. Very few '67 Z's changed hands in 2003, however a number were advertised for sale at some pretty high numbers! On the lower end of the scale, project cars brought between $15,000 and $25,000 - I know of 3 that sold. One decent driver quality car with cowl plenum breather sold for $35,000 and a cross ram equipped number one car just sold for $75,000!!! (the cross ram set-up is worth $12,000-$15,000 alone). Those not selling include a pair of consecutive body numbered cars in number 2/3 condition asking over $125,000 for the pair; a number 1 show car asking $100,000, a fresh number 1 car with CE block at $70,000 plus, a strong number 2 RS asking $100,000, and another number 3/2 standard grille car asking $52,000. Personally, I see the market like this - Projects are in the $15,000 to $30,000 range; Drivers (number 3 cars) are in the $30,000 to $45,000 range; Number 2 cars are between $45,000 and $55,000; and Number 1, absolutely fresh and correct show cars are $55,000 - $65,000. Documentation and numbers matching motors appear to be more important today than they were a few years ago and can affect the value by as much as 30%. This may be due to the fact that more and more '67 Z's are being located and the registry now has 188 cars accounted for. Therefore, these cars aren't quite as difficult to find as they were 5 or 6 years ago when only 130 or so had been located. Buyers are now being a little more selective in their purchases - especially at the higher end of the market. Also, the number of fakes is increasing and buyers want some assurance that their potential investment is legit before they spend the kind of money that these cars are commanding. If you have any market input or want some help placing a value on your car (or parts) please feel free to contact me and I'll try and assist you.
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If the car is complete with original drivetrain, I could easily see it selling for $35K. Professionally and correctly restored, it could get $60-75K in today's market but I feel they're still undervalued and haven't trended up in value as much as the 1969 models. There are some parts that are very difficult and expensive to find such as: distributor, rally wheel trim rings, rally wheels, fan and fan clutch. Heads, intake, carb, shifter, alternator, and traction bar assembly are expensive but available.
If the car is anywhere near the Northwest, I'd be glad to inspect and authenticate it for you. If you want a real professional to inspect it, try
Jerry MacNeish.