Use a 4" grinder and a good pair of safety glasses for starters. then sand blast the area. followed with a thin coat of mar-glass.from that point start shaping the area to match the original shape using 80 grit. don"t be too fussy with the 80 grit leave it a touch high, double check the shape...
I believe that my love for the A bodies started when i was twelve years old. My dad totaled out his Demon on the way to watch Jaws in the theater. Someone turned out in front of him. so he then purchased a 1975 Dodge Dart Sport, and that was when it all began for me.
Forty two years later I am...
I would recommend that you go a little higher. One thing to keep in mind is that a pop thru the carb can take out the power valve, especially if the carburetor doesn't have a check valve to protect it. A blown power valve will cause a rough idle.
You may need a stronger Power Valve. measure your vacuum with the engine as lo as it will idle, divide your vacuum reading in half, that is the size power valve you will need.