i have a banshee with a cool head with 22cc domes and 2 in to 1 dynoport exhaust. i have vf3 reeds, 28mm keihin pwr carbs, and a timing plate that im going to set at +4 coming on the way. what my question is can i go to a lower cc dome and still beable to run 93 octane? if it matters im a 919ft elavation. thanks for any help.