I am an insurance guy and I highly recommend you do this with not only your classic cars but also your homes and any pole barns or other structures you may have. The cost of construction has sky rocketed. If you do not have rental insurance on your daily drivers insurance policy you might consider adding or if you do have it increasing the number of days or limits as with the part and labor shortage the time it takes to repair a car has increased significantly.My insurance agent is a car guy and just suggested I up my car's value on the "agreed value" in my policy! So that might be something everyone may want to look into.