318 to run 13s

I have a stock 318 with a 650 holley jetted at 68 and 70. RPM Air Gap. Hooker Headers. Mopar Electronic ignition. 8.75 sure grip with 3.91`s, running a 26 x 9.5 x 15 Hoosier QTP tire. And a 904 with a stock converter. It will run a 13.65 all day long. I was in the staging lanes at the March Meets and a guy walked over to my car and asked all about my drive train. I told him and he said "theres no way you can get that time with what you have". I told him "watch me". I had dialed a 13.60 to be on the safe side. I ran a 13.61. He found me in the pit about an hour later and apologized.