for a small fee a machining shop that has a CNC machine can port each runner equally. This way they all flow the same CFM, best results are had with this method. But if you're going to gasket port, just line up the holes of the gasket with the studs, use a sharpie to outline the inside of the gasket and port until that line is nearly gone, then polish. im sure theres like a step by step website if you're still not sure about it...just google it.