i'm planning on running a +5 crank after this winter. i planned to take a CP 11:1 piston and have it cut down to 10.5:1 but i'm wondering if, with the +5 crank, i just leave the 11:1 could i still run 93 octane pump gas? i will also be running a KDS racing CNC ported head, +2 valves, RJ cam, and i already have a +3 TB and barker duals. do you guys think i should still have the piston milled down or will it be ok? and i'm just curious is there enough valve releif in a CP 11:1 for +2 valves and a RJ cam?