I'm reassembling my 454mag efi after getting the block back. I'm kinda confused, on the back of the fuel rail there 3 holes, according the manual, the upper for the fuel line, the middle for the nut, and this is where I'm messed up, the third bottom hole is left unfilled? The manual shows a plate, but I don't remember taking one off and I don't have extra parts, so does anyone know if that bottom hole can be left open?