it's hard to tell by the pic... the hole your talking about is about 1 1/2 inches above and say 1/2 inch to the left of the header's current location? if so then your still not located right. see if you can get that header between the engine and main tank... set the header tanks center(middle of the tank) about 1/8 inch below the carb centrline... use the high speed needle as your carb centerline.

John

fuel lines... keep the line between the main and header as short as possible... keep the header to carb line also as short as possible BUT go ahead and add your filter/ fueling set up and keep it long enough to make fueling easy.