If your looking to get 290-310hp N/A you have a lot of work to do my freind and a lot of money to spend. It can be done, it just cost more. Not sure where you are located either, but an all motor build like that will never pass emissions. If that is not a concern than good luck to you, cause just about everything all motor will have to be done to attain your goal. Stroke, port/polish (max port), pistons (domed), rods, cams (stage 3), IM, intake, header, exhaust, crank, flywheel, clutch, valvetrain...geez that doesn't even sound like enough. I gotta be leaving stuff out. That will probably get you 250. But with that being done, it would be safe to squeeze (NOS) to get to that 290-310 mark. Good luck!!!