Well its a 87 stock 302 and the fuel system is stock as well,however i did do the maf conversion,and it does have a bbk off road x pipe.last time it was put on the dyno the car fuel ratio was 11.7.my ?? could bad oxygen sensor cause this or did anyone ran into this problem before, i am using 93 octane fuel and the cars starts to ping under heavy throttle,and sometimes it wont ping any sugestions or info on how to fix this i would greatly apreciate it

 

the ping is too much timing. or bad gas, but i think timing. and why is rich, could have leaky injectors, or bad fpr