K&K are one of the big dogs (perhaps the biggest) in motorsport team insurance but they don't cover on track damage to your race car. Pretty much everything else though. At one time Bisa was offering on track insurance but the limit was pretty low, 100k or so IIRC. There are several track day policies but finding something for wheel to wheel racing is tough and if you do it's going to be expensive. Back when I first started racing the guys I was buying the ride from told me not to race anything that I wouldn't mind seeing pushed off a cliff.