Dart is totalled.. now what ?
I dont know what insurance company you/the guy has but State Farm used to be good at reimbursing you for the parts you can prove you had on it. Here lately they have got tougher.
You should be able to find an attorney that shouldn't cost more than a couple thousand that can get you taken care of for sure. If your car is truly worth more than 10k I would be willing to pay for an attorney. Just make sure you can prove your car is worth what you say it is. Receipts and comparable vehicles that have sold at auction or classic car dealers.
I know it isn't right but just cause a car is worth what it is doesn't mean the rest of the world or a judge and jury will see it that way. Without the documentation to prove it they will probably come up with a similar number to the insurance company. People like my wife never can understand how desirable some of these classic cars really are, supply and demand makes them valuable.
A good example of this is a goofy little SUV I want to get my hands on.. The Isuzu VehiCross. They were made just over 10 years ago. Bluebook values them at like 3000 but since so few were made they sell for 8K and more. Ive seen ones with salvage titles listed for 5k. Thats only a 10 year old vehicle that doesn't have a huge demand. Now add you have a performance 35+ year old vehicle that has much more interest.... Much more value. A good attorney, especially one with an interest in classic cars could drive this point home much better than me and make this whole ordeal right I'm sure.
Keep us updated.