I use Costco Car Insurance which is Ameriprise and I highly recommend them.
Not sure on what they would value your car. That's the problem with collector cars.
I have had 2 claims with them and they went above what I expected.
Gave me more than I paid for my truck when it got stolen.
They paid me more than I paid for it 7 years ago and I drove 125k miles.
I have my collector cars insured thru Hagerty
ritrebor