Weiands tech manual on supercharging states you need to keep your "effective" compression ratio at 12:1 or below when running pump gas (92 Octane). According to their charts 8.5:1 compression and 6 pounds boost equals 12.0 effective compression...the maximum you should be running.
Your guess-timated 9.3 compression with 6 pounds boost will equal 13:1 effective compression. I'd say you'll have to run some sort of boost retard timing control to control detonation...Deen