Another 1st time port job thread

Good start there. You can grind out the valve cover bolt bosses in the port window like they were never there. Don't worry about breaking through, you can Loctite in some studs if you do. Also blend down the machining ridge from the top cut in to the chamber. One of the keys in getting good flow is a 3 angle valve job and decent back cut valves (usually stainless).