72 duster 360 NA to 390 Turbo

Cool project......but I have to ask, did I see you said you machined the valve seats .080" DEEPER? Man, no way would I have done all that. The valve seat area is one of the thinnest places in the head. Has water right under them. Maybe the Magnum stuff is thicker there, I don't know. Good luck with it! It sounds strong!