Jandro, I think youll be fine running 93 maybe even 92 octane. I run a 455 w/4X-7H heads (2.11/1.77 valves)and 9.4 to 1 compression, 1.65 rockers, Crane Power Max Hydraulic Cam H-288-2 (.503/.520) which has a 114 LSA, Flat Top pistons, Edelbrock Performer RPM intake, Rochester Quad (rebuilt-800cfm) and I use 89 octane but I used 92 when I did the break in runs.
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A.J. "Bulldog" Murphy, MSgt
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