You are correct. Like I said easy to make 350-400 HP and make it live a long life. 16 PSI is going to make it into a monster. It will also require precise timing control or a very short life of engine.
A good rule of thumb. For every 1 PSI you will gain about 6% gain in TQ. So in your case. If you can make 270 tq N/A Add 16.2 ft lbs per psi. So about 532 FT LBs at 16 PSI.
