How to build a 13 second 340 Duster

I had a 440 with low compression TRWs .080" in the holes) L2266s ? and a set a very milled heads that would not run on pump gas. I never measure the compression on it but thosepistons are rated at 8.5:1. With my milled heads and .022" gaskets I fiigured around 9.5:1 but it could have been higher. As soon as the motor got warm it would ping like there no tomorrow.