Ok I put a ported, shaved heads and cylinders 440 fan with .025 copper head gaskets in my 73 el-tigre. It has 145 lbs compression dual mikunis with 300 mains, the 340 cdi igniton system. I'm running the old 87 octane that was in the tank and once it's warmed up I can hear it ping soon as it starts to run on the pipe under normal acceleration. I'm not pounding it yet, I don't want to blow it up already LOL. Am I going to need Av gas or turbo blue or is just 93 good enough? Even if I don't hear it ping, it could still be pinging right?