the speed limiter? what are you talking about, its at ~165.

anyways, go to revxtreme and have jeremy tune the car for you before you go doing all these mods. on a stock bottom end, it isnt going to last long above 450. the ringlands are junk and are commonly the 1st things to give way. and your going to see more out of a "50 shot" than you think. i would back the pill sizing down to what they consider a 25-35


btw, rich and little timing is for longevity. you werent losing all that much power from what they made peak at STS.