Think I'm screwed

You can fix it with a welder and some wire. I wouldnt cut it out of another car just buy the parts and start new. You could buy the dart and fix it up and have two cars instead of taking two to make one. These cars are not repopulating once there gone there gone forever. Every one that gets parted out to save another is 2 less cars for someone to fix. That's just the way I look at it. Plus if I was doing that kinda project I would want to start with new metal and not risk cutting out a second rusty one.
A welder and some wire? That's it? Damn, I wish I would have known that when I started on mine. Could have saved myself a lot of money. Lol