Make the insurance company replace it. And be real picky about what you find as a replacement that's a rare piece. I doubt from the looks of things it can be repaired, but I could be wrong. Just don't let them off by paying you what THEY thinks it's worth.
All that said I hope that no one was injured, and I'm so sorry it happened.
I hope you had an appraisal from a legit company before the accident.
My uncle got hit hard in his nice original, 63 galaxy in the rear.
The guys insurance said my uncles car was only worth $800 complete BS.
He handed them a appraisal from a well known company for $30,000.
He still has the galaxy an it is now super nice, the insurance paid alot of money to fix that car.
Ouch...if the unibody didn't get tweaked and it's good from the firewall back, you should be able to find front end parts (same for Dart and Dart Wagon, right? - lots of Darts out there and everything but the grill/headlight trim/bumper/hood should be the same for '63-'65, I think)
Get ready for a fight. Insurance companies will say front end damage, whether your fault in the police report or not, "should" have been avoided and they will try not to pay.
A woman turned into me in my 04 Ranger in February, 2014 and totaled my truck out. That's the FIRST thing the insurance company asked me. "Did your truck have frontal damage?"
Lucky for me, not one thing on the front was touched. It was the whole right side. Good luck man.