The hardest part was to weld in the patch where the vent was. A friend of mine made up the ring and flat piece. Pretty good fit. The metal was shot on the edge from the top of the brake master cylinder all the way to the drain under the wiper motor. We brazed those areas. Next, I'm going to weld up the holes that are throughout the firewall. Then weld on the cap. By the way, does anyone know the best way to seal the top cap onto the lower cowl? When I removed it, there was a sealer used from the factory.