How rare is this car?

My dad just picked up a 67 dart GT 273 4bbl for a really good price,Thats been in storage since 1983 complete, original and in pretty decent shape other than 1 repaint from red to green in 1973ish. tag is there and i'm pretty certain im gonna find a build sheet. I ran the Vin and checked the tag and its the real deal, my question is how rare is this car does anyone have any production numbers or a way for me to research how rare this car is? I basically only see the dart gt in books and magazines the few gt 273"s i have seen are more the 65's. The car is cool so no matter what its getting the full on resto we're just curious. thanks