Save money by not getting oversize valves and ported head and use it on a good ecu.
Any turbo to make 450-500 on a 4g93 is going to be super lazy. Id go pistons, rods, mls headgasket, 60mm evo throttle body, factory head with a set of 272 cams,big injectors and e85, maybe a gtx2971 with a good...