I bought a set of AFR 1.90/1.60 , 60cc heads for my 94 GT. My car is also my daily driver and I use 87 octane during my daily 60 mile round trip from work everyday. I was told that the new compression ratio when I install the heads will be 9.77:1. Will I still be able to use 87 octane with 10 degree timing for my daily commute, or will I need to move up in octane and change the timing to prevent pinging and detonation?