im about to add a cool head and was wondering what gas i have to run if i get 20cc domes which should bring me around 169psi.....im at sea level...... and do i need to get the crank trued and welded and if so should i do it to the stock crank or get a aftermarket one? ....my mods so far are t5 pipes, v-force3 reeds, +4 timing, k&n filter w/no lid and outerwears, boost bottle, hi-flow impeler, tors eliminated, and 28mm carbs that im thinking about putting on......i think thats it