Phase 1 / 2/ 2x2???
tb spacer is a waste. don't bother with rockers, unless you want to do the trunion upgrade. if you don't want to tear into the motor then i would recommend nitrous. a 100 shot is easily dealt with by a stock ls1 and should get you to see your goal. if nitrous is not your thing then cam, valvetrain, and head work are in your future. if you want to go that route let me know and i can help with suggestions.

