I have used American National Insurance for nearly 20 years for Home and Cars.
https://www.americannational.com/
I have my 72 under their classic plan, up to 25,000 with no appraisal over that and you need one. Under the classic plan it has to be kept in a covered space, like in your garage and limited driving. Which I also have antique Texas plates (72 Tx plates too!) which the insurance more or less follows the same rules for Texas antique plates (least 25 years old, and can only be used on a limited basis such as car shows, exhibitions, parades, and travel to and from repair and maintenance facilities).