Spark plug and timing recommend

My 408 10.1 to 1 compression motor running EQ heads liked 30 degrees best. We started at 34 on the dyno, and picked up about 12 or 14 hp going from 34 down to 30. Timing marks were set with a dial indicator, dead accurate marks. Fuel was 3 gallons of pump 93 and 2 gallons of 110 mixed in.