Hello everyone. Chances are good that what you have is an old Fiberfab kit. Do a search on the internet, they made several different ones that were GT40 like (Valkyrie, Avenger).
I'm almost sure that is what Archie is using for "his" replica.
Its only worth as much as you're willing to pay. I've seen completed cars (needing major work) from basically nothing to $6000 or so. Now some of the newer and more accurate GT40 replicas are a lot more expensive but they're not as old as what you've discovered.