You might have some carbon deposits in your combustion chambers which will cause your car to ping. Try using an intake valve cleaner or premium gas from Chevron or Petro Can that have a deposit control additive for a couple of tanks.
With my setup (10:1 comp and 13 degrees of timing, iron heads) I need at least 92 octane to keep things safe.
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393W: AFR 205's, hydraulic roller, TKO600.
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