I have a 489 BBC iron block with aluminum heads, full roller, decent cam with a Full MSD ignition and adjustable timing retard controller. I just got my motor in my car and have only fired it up to get on and off the trailer and into my garage. My buddy was at my engine builders shop the other day and asked him what compression my motor was running and he told him 13:1. I was always told that when running pump gas it's pushing it to go over 12. Do you think I will be ok driving this on the street with 93 octane?