1970 340 Duster rare x car.

I have read this all with interest. It reminds me of the Antique Road Show. People come in with the grandiose stories about their item. Some are true, some aren't, but it is always stated, if you can't prove it it doesn't matter. You have no fender tag and no build sheet. That is extremely serious proof to be missing from what is called a rare car and an original car. Nice story. Might be true, might not be. With no proof it doesn't matter. What it is now is a 340 Duster. Find the build sheet and fender tag, then we might have something!