hard to put a number on it - too many unknowns. Will it be blow through or draw through? what are the cam specs? turbo size and exhaust manifold stock, modded, or a header? Stock starquests were 140 - 188 hp with tbi injection. With the right combo - 250-300 hp easy. You may want to rethink the carb for an off road rig and a turbo - keeping the carb working properly will be a real challenge.