Mom and daughter looking to restore 74 Dart or Duster

Hi everyone.
I am so glad we found this site. My 16-year-old daughter and I are shopping for project cars. We found a 74 Dart Swinger 2-door and a 74 Plymouth Duster.

The Duster appears to need less work and I just love the body style (from my younger days!) My daughter just loves cars and shares my "Old Car Fetish."

Can anyone advise me on whether one of these cars would have greater potential value than the other, if all things were equal? Also, what price range could we expect to pay for an "off frame" restoration, with a solid body and very little rust? Front floor pans in the Dart are rusted out, what should I expect to pay to have that done right?

And, most importantly, WHERE can I find all the bits and pieces I can't seem to locate through JC Whitney? I cant find a turn signal assembly for the Dart anywhere.
Thanks, I hope some of you can advise us. It has been a dream of mine for so long to restore an old but drive-able MOPAR, and anything you can do to help us will be much appreciated.