Depends on your set up....what has been done to the bottom end? you say built meaning what Higher compression pistons, or just rebuilt stock or what, that is a factor an your head to determine whats best for your set up, you going boost, nitrous, supercharger, N/A are you going to get it tuned? If you got just a simple mild set up stock bottom end, I say just change your exhuast valve springs to Type r, and install Type r cams, out of a 01 model....But if it was me, ill go with stage 2 Skunk 2 cams, with there valve springs, an retainers, an get it tuned after that, 255 fuel pump, bigger intake an throttle body, an roll