I'm really sorry to hear about your car—that's a tough situation. First off, it’s great no one was seriously hurt, but dealing with the aftermath is no small task, especially with such a classic car. For further advice, it might be worth checking out
CEDA as they have resources that could guide you through dealing with costs calculation if necessary for the lawsuit. Regarding a mechanic, it might help to connect with local car clubs or forums dedicated to Supras or JDM cars—they often have members who can recommend specialists who deal with vintage models. Also, don’t forget to document everything as meticulously as possible, it will help your case, especially when dealing with insurance assessments and legal discussions. Hope everything turns out okay for you and your car.