That`s some heavy stuff there. Cab, I drive my dart on 91 at 12.11 comp which cranks around 165-170 psi but, I would never race it that way no matter what anybody says.....just me. My last best was w/4 gals. 91 and 4 gals. of trick 110 leaded and my # 8 ngk`s show no signs of detination and may even go straight 110 at my next track outing.