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http://www.jegs.com/i/Chevrolet-Performance/809/12530283/10002/-1This engine has vortec heads and a roller cam. Wouldn't this be a better starting point considering the zinc has has been taken out of engine oil? The vortecs flow great and roller cams have much faster valve opening than flat tappet cams. I thought I read vortec heads are worth 30hp over other small block heads. Don't hold me to that, but seems right.