ok im getting ready to run alky or look into it, looking at sum mikuni 38tms w/pjs or 39 pwks, bike is a 370lr drag ported, blaster pistons, 17cc domes, already have a timing plate, a pingel, etc. have 17 cc domes and copmpression is at 175 lbs on each side, i will be using castor 927 premix, ridin at sea leel.. do i need more compression? how much do i or can i advance the timing?