you need a good quality head. Good cam profile for BOTH cams to match up proper turbo applications. valves that can resist high-temp heat, good retaining spring, proper cam timing, but mostly, breathing. Get a good port flow for BOTH ports. (this means port and polish) good intake and turbo exhaust manifold. second, a mid to full built block. sleeves will help out detonation, since you are going turbo applications, you don't need such a high compression, but not on stock internals, try a 10.5:1 or just 10:1 pistons, rods is a must, plus get a good holding clutch to not lag off speed.