An idiot killed my baby. Need advice.

I would contact the other driver and ask him what his intentions are on paying your damage. Tell him that if he pays you will not contact his insurance.
You will be surprised how fast you get paid. I am sure he didn't contact the insurance and is hiding the damaged car. If it becomes known to that bank that his car is totaled they will demand immediate payment of the loan. It will be cheaper for him to fix your car.
I knew someone that crashed a new car at the track. He hid the car waited a while and then reported it stolen to get the bank note paid.

I believe some strategic phone calls to him will get you paid. You know he didn't contact his insurance and probably don't want to for various reasons such as insurances rates,loan, and lies he already may have put forward to others.

Threatening the call to authorities may turn the table for you. Just do it in the proper sequence. I just battled the insurance for damage as well. You never want anyone else's input into your business after you already told your story of what happened to your insured car after you gave your statement.

The ball is in your court , Make your moves strategically with him. Be calm and tell him if he don't pay you will have to contact his insurance which he knows will contact his bank.

Been there.

Also getting another body is the best move . Your car is dish ragged and not very good for a drag car. Maybe you can fix it for the street or for resale. If it was a valuable rare numbers car that would be different. But not a base Duster its just not worth the time.