Replaced valve cover. Broke a bolt in process and stripped 3 holes. Helicoiled 2 of the holes. The bolts wont go down all the way in the helicoil. One of the helicoil holes. I drilled straight into the engine. For the bolt that broke off all I did was pour liquid silicone in the hole and around the where the gasket is. The only thing that is leaking is the bolts that wont go all the way into the new helicoil. I know I totally ruined the car, what else should I do and can I drive the vehicle 600miles and back. Also it's not boggin down anymore like it was before I plugged the hole with silicone.