It depends on what buyer you find. If you find that buyer whose restoring a 67 GTX, you could potentially have a 1000 dollar set of heads. Other than that, they are worth about what the rest are and their price will come down to condition. I would say 300 or so needing rebuilt and maybe 500-750 if they are worked and ready. Unless someone had the correct car for them to go on, it will make little sense to spend a lot of money.
