Not that my opinion matters but i personally rode cameron's (redline) 350 at LS! Its a BADASS little setup! It was beating up alot of bigger motors out there. With that said, if your worried about fuel mileage, im sure your not gonna want a "drag" ported 350. Sure it will be fast but im sure its not gonna be a real fun quad to trail ride around. (Im assuming your gonna trail ride being you want to keep stock carbs for fuel mileage?)