Well you have a few options you could
1. Give Bisimoto access to all your assets and ask him to build it for you
2. Sell your car and purchase an LSX powered car
3. Place your single cam under the dyno while you tune in your 300 hp K series
4. Give up on n/a and turbo charge it
The fourth option is the cheapest, easiest and fastest way to achieve your 300hp goal. Out of curiosity though why did you arbitrarily choose the number 300?