Look What UPS Just Delivered!

At first i thought that car the welder is on its a 66/7 belvedere but the top of the fender is too narrow.

The lines on the fender are real pronounced, what is that car??
It's a '71 Duster. There's another car in the pic too. Thanks for all the replies. I think I will buy local to be sure I can get the tank filled.